B1+ Focus: This advanced vocabulary set extends the words from Parts 1 and 2. These terms appear throughout the Grammar Lab and exercises — pay attention to how they combine with modal verbs.
Elusive (adj.)/ɪˈluː.sɪv/Неуловим, труден за намиране
Territorial (adj.)/ˌter.ɪˈtɔː.ri.əl/Териториален
Migratory (adj.)/ˈmɪɡ.rə.tər.i/Мигриращ, прелетен
Venomous (adj.)/ˈven.ə.məs/Отровен (животно)
Solitary (adj.)/ˈsɒl.ɪ.tər.i/Самотен, живеещ сам
Parts 1 & 2 — Quick Modal Reference & Recap Quiz
Check you remember all forms from Parts 1 and 2 before starting the Grammar Lab.
Present / General (Part 1)
Modal
Meaning
Example
must
Almost certain (evidence)
He must be an expert.
can't
Logically impossible
She can't be tired — she slept all day.
may / might
Possible (maybe)
It might be a wolf track.
could
Theoretical possibility
That could be a badger.
can
General truth / ability
Wolves can run very fast.
Past — Modal + Have + V3 (Part 2)
Modal
Meaning
Example
must have
Almost certain (past)
It must have rained.
can't have
Impossible (past)
She can't have seen it.
should have
Regret / criticism
We should have checked it.
could have
Unrealised possibility
You could have taken a photo.
might/may have
Past uncertainty
The fox might have left.
needn't have
Unnecessary (but done)
You needn't have bought more food.
📝 Quick Recap Quiz — Parts 1 & 2. Choose the correct modal.
1. The bear tracks are fresh and lead into this cave. A bear ___ be living here.
2. She has been studying wolves for fifteen years. She ___ be a complete beginner.
3. That sound in the bushes ___ be a hedgehog or a rabbit — we are not sure.
4. He didn't bring a raincoat and got soaked. He ___ checked the weather forecast.
5. The gate was locked all night. The fox ___ escaped through it.
6. You boiled water for tea — I'd already made some. You ___ bothered.
7. Migratory birds ___ travel thousands of kilometres — it is a biological fact.
8. Nobody knows exactly where the wolves went. They ___ crossed the river, or they may have gone south.
Grammar Lab: Advanced Modal Uses
Part 3 focus: This lab covers four new areas: (a) should / ought to for advice and expectation; (b) will / would for future certainty and past habit; (c) ability modals — can / could / be able to; and (d) perfect continuous modals — modal + have been + -ing, used when you deduce an ongoing past activity.
1. Should & Ought To — Advice, Expectation & Mild Obligation
Formula: should / ought to + infinitive
should→Advice or expectation (it is the right / expected thing)You should stay on the marked trail.
ought to→Same as should — slightly more formal; based on duty or expectationVisitors ought to respect the wildlife.
should be→Future expectation — you predict it will happen (but it is not certain)The wolves should be back by spring.
💡 Should is more common in everyday British English. Ought to sounds slightly more formal. They are interchangeable in most contexts.
✔ Advice (what is the right thing to do) You should report any sightings to the ranger.
✔ Expectation (you predict it will happen) The deer should return at dusk — they always do.
Negative — should not / ought not to
You shouldn't feed wild animals.
Visitors ought not to approach the den.
Both mean: it is the wrong or inadvisable thing to do.
Question form — should
Should we report the fox sighting?
Where should we set up the camera?
⚠ Ought to is rarely used in questions in modern British English.
📝 Easy: Choose should, shouldn't, or ought to.
1. You ___ stay on the path — the marshland is dangerous off-trail.
2. Hikers ___ leave food near the animal dens — it disturbs natural behaviour.
3. The birds ___ arrive next week — they are always on schedule in spring.
4. Conservation officers ___ inspect the reserve at least once a month.
5. You ___ disturb nesting birds — it can cause them to abandon their eggs.
🎯 Hard: Complete with should / ought to + the correct form of the verb in brackets. Some are negative.
1. The fox population ___ (increase) now that the new habitat is in place — we expect good numbers.
2. You ___ (not / approach) a badger set during breeding season — the sow may abandon the cubs.
3. All volunteer rangers ___ (complete) the safety training before entering the reserve alone.
4. The research results ___ (be ready) by the end of the month — the lab is almost done.
5. We ___ (not / cut) the meadow in June — that is exactly when the rare orchids are flowering.
2. Will & Would — Future Certainty & Past Habits
will→Strong prediction / near certainty about the futureThe wolves will return when prey is plentiful.
would→Past habit — a repeated action that was typical in the pastEvery spring, the deer would graze near the stream.
⚠️ Would for past habit — state verb warning:
✔ She would walk the trail every morning. — action verb ✓
✘ She would know the forest well. — state verb ✗ — use knew or used to know
Form
Meaning
Example
will
Strong future prediction
The ecosystem will recover if protected.
won't
Prediction of non-event
The bear won't return this winter.
would
Past repeated habit
He would walk the trail every morning.
wouldn't
Past refusal / negative habit
The old fox wouldn't come near people.
📝 Easy: Choose will, won't, would, or wouldn't.
1. Every evening, when my grandmother was young, the swallows ___ gather on the telephone wires above the barn.
2. If we protect the woodland corridor, the red squirrel ___ naturally spread north.
3. The old boar ___ approach the feeding station — he was always too cautious.
4. Without intervention, this species ___ survive the next decade.
5. As a child, she ___ spend all summer looking for insects in the garden.
🎯 Hard: Write will / won't / would / wouldn't + the correct form of the verb in brackets.
1. In the early days of the reserve, the rangers ___ (check) every camera trap on foot — there were no vehicles.
2. If the invasive plant species spreads further, it ___ (destroy) the native wildflower meadows within five years.
3. The old wolf ___ (eat) meat from the feeding station — she only hunted live prey.
4. With proper conservation, the lynx ___ (return) to these mountains within a generation.
5. Every spring, she ___ (walk) the same route to count the nesting pairs along the riverbank.
3. Ability — Can, Could & Be Able To
💡 All three express ability, but they are used in different tenses and contexts.
can→Present ability or general truthShe can identify any bird by its call.
could→Past general ability — repeated or always true in the pastAs a child, he could name every butterfly.
was / were able to→Managed to do something on one specific occasion in the pastDespite the fog, she was able to photograph the eagle.
⚠️ Key distinction:
✔ He could swim very fast. — general ability (always true in the past)
✔ He was able to swim to shore. — he managed on that one occasion
✘ He could swim to shore. — avoid could for a single successful past event
📝 Easy: Choose can, could, or was / were able to.
1. After hours of searching, the team ___ finally locate the wolf's den.
2. As a young researcher, she ___ identify over 200 plant species from memory.
3. Owls ___ rotate their heads almost 270 degrees — it is a biological fact.
4. Despite the bad conditions, the ranger ___ rescue the injured deer before nightfall.
5. When I was a child, I ___ spend all day outdoors without getting tired.
🎯 Hard: Write can, could, or was / were able to. Think: general truth, general past ability, or one specific managed occasion?
1. The fox ___ (general — now) squeeze through a gap as narrow as its head.
2. He searched for hours, but eventually he ___ (one specific occasion — past) find the nesting site.
3. In her twenties, she ___ (general past ability) recognise every bird in the region by sight and sound.
4. Although the storm was severe, the research team ___ (one occasion — managed) complete their survey on the last day.
5. Salmon ___ (general truth) leap up to three metres to pass waterfalls during migration.
4. Perfect Continuous Modals — Deducing an Ongoing Past Activity
Formula: modal + have been + verb-ing
must have been + -ing→Almost certain it was happening over a period of timeThe wolf must have been hunting all night.
can't have been + -ing→Logically impossible it was ongoingShe can't have been sleeping — her light was on.
might / may / could have been + -ing→Possibly happening over a period — you are not sureThe fox might have been foraging near the camp.
Single completed action:The wolf must have crossed the river. — it crossed once
Ongoing activity:The wolf must have been crossing for hours. — it was in the process
📝 Easy: Complete with the correct perfect continuous modal form. The modal is given.
1. The ground around the den is freshly dug. The badger ___ (must / dig) there all night.
2. She has mud all over her boots. She ___ (must / walk) through the wetland.
3. The birds look exhausted. They ___ (might / fly) for days without stopping.
4. His notebook is completely full. He ___ (must / take) notes for hours during the survey.
5. The fox looks very thin. It ___ (might / struggle) to find enough food this winter.
🎯 Hard: Choose the right modal AND decide: simple perfect (modal + have + V3) or continuous perfect (modal + have been + -ing)? Think whether the action is a single event or an ongoing process.
1. The camera shows the wolf at the den entrance for three hours. It ___ (must / wait) for the badger to emerge.
2. The trail ends here. The deer ___ (must / cross) the stream at some point and continued on the other bank.
3. Her hands are covered in soil. She ___ (might / plant) seedlings all morning.
4. The enclosure gate is open. Someone ___ (must / leave) it open last night — it was locked at sunset.
5. The bear looks well-fed and heavy. It ___ (must / eat) large quantities before entering hibernation.
5. Full Modal Map — All Three Parts
Use this table as a complete reference card for all modal verb meanings covered across Parts 1, 2 and 3.
Function
Present / Future form
Past form
Almost certain ✔
must be
must have done / must have been doing
Logically impossible ✗
can't be
can't have done / can't have been doing
Possible (~35–50%)
may / might / could be
may / might / could have done / have been doing
Advice / right thing
should / ought to do
should have done (but didn't)
Criticism (it was wrong)
shouldn't do
shouldn't have done
Unrealised option
could do
could have done
Unnecessary action (done)
—
needn't have done
General ability
can do
could do (general past)
Single managed action
am / is / are able to
was / were able to
Strong future prediction
will do
—
Past habit
—
would do / used to do
🎯 Advanced Mix: Choose the best modal. Use the full modal map above.
1. The evidence is overwhelming — the animal that made these tracks ___ be a wolf. No other species in this area is large enough.
2. He says he photographed a snow leopard in Bulgaria. He ___ invented that — they don't live here.
3. With the new wildlife corridor, the lynx population ___ recover within a decade.
4. She ___ identify every European owl species by ear alone — she had been training for years.
5. Every summer as children, we ___ watch the swallows arrive and count how many returned to the same nests.
6. Look at the camera trap footage — the wolf ___ near the stream for hours before the deer appeared.
7. We ran the whole survey again yesterday — the data was already collected. We ___ it — it was a waste of a day.
8. Despite the heavy snow, the rangers ___ reach the injured deer and bring it to safety.
Modal Passives: Modal + Be / Have Been + Past Participle
B1+ Focus: Modal verbs combine naturally with the passive. This section covers both present and past passive modal forms — a key B1+ skill for reading scientific and nature writing.
The Passive with Modals — Formula
Type
Formula
Example
Present passive
modal + be + past participle
The forest must be protected.
Past passive
modal + have been + past participle
The gate must have been left open.
📝 Exercise 1 — Present Modal Passive: Complete with the correct modal + be + past participle.
1. These wetlands are protected by law. They ___ (must / damage) under any circumstances.
2. The rare orchids are fragile. They ___ (should / handle) with great care.
3. The wolf tracks are fresh. The animal ___ (might / find) nearby.
4. New camera traps ___ (will / install) before the breeding season begins.
5. All visitors ___ (must / accompany) by a registered guide in the restricted zone.
🎯 Exercise 2 — Past Modal Passive: Complete with modal + have been + past participle.
1. The fence was broken and the enclosure empty. The wolf ___ (must / release) accidentally overnight.
2. The rare plant has disappeared from the meadow. It ___ (might / dig up) by animals.
3. Nobody warned the hikers about the nesting area. They ___ (should / inform) before entering.
4. The camera trap was facing the wrong direction. The animal ___ (can't / photograph) clearly from that angle.
5. The DNA results show the species. The sample ___ (could / collect) as long ago as 1980.
🎯 Exercise 3 — Mixed Modal Passives: Use the modal in brackets to make the correct passive form (present or past).
1. (should) All wildlife data ___ (record) digitally to prevent loss.
2. (must — past deduction) The nest ___ (destroy) during the storm — it was fine yesterday.
3. (can) Badger sets ___ (identify) by the shape of the entrance and the soil markings.
4. (ought to) The injured eagle ___ (transfer) to a specialist centre immediately.
5. (might — past deduction) The habitat loss ___ (cause) by the drainage work done twenty years ago.
6. (will) The conservation report ___ (publish) next spring after all data is verified.
7. (could — past unrealised) With more funding, the wetland ___ (save) before it was drained.
8. (must) Every camera trap ___ (check) before the field team leaves the site.
Cloze Text: The Return of the Wolf
Task: Read the article and select the correct modal word or phrase in each gap. All modal types from Parts 1, 2 and 3 are tested here.
Key Word Transformation (KWT)
B1+ Exam Skill: Rewrite the second sentence so it has the same meaning as the first, using the KEY WORD given. Do not change the key word. Use between 2–5 words.
Exercises
Practice: These exercises cover all modal forms from Parts 1, 2 and 3. Work systematically. The final exercises include translation from Bulgarian.
Tense Writing: Full Mix — Plants & Animals
Task: Put the verb in brackets into the correct tense or modal form. Each sentence has exactly one blank. Where more than one answer is acceptable, both are credited.
📝 Exercise 1
1. When she was young, her grandmother ___ (tell) her the names of every plant in the meadow.
2. The ranger ___ (search) for the injured fox for three hours before she finally found it.
3. The bear tracks are fresh. The animal ___ (must / pass) through here this morning.
4. Salmon ___ (can / swim) upstream against powerful currents to reach their spawning grounds.
5. We ___ (set up) the camera trap at dawn when the first wolves appeared on the ridge.
6. By the time the conservation fund was established, the wetland ___ (already / destroy).
7. You ___ (should / not / leave) food near the den — now the fox comes every night.
8. The research team ___ (study) the wolf pack's movements for the past six months.
9. The injured eagle ___ (currently / treat) at the wildlife centre and will be released next spring.
10. All volunteer rangers ___ (ought to / complete) the safety training before working alone in the reserve.
📝 Exercise 2
1. Despite the darkness, the ranger ___ (be able to / spot) the fox using night-vision goggles.
2. If the invasive plant species spreads further, it ___ (destroy) the native wildflower meadows within five years.
3. Nobody knows where the badger went. It ___ (might / leave) through the gap in the eastern fence.
4. Every morning in the old days, the shepherd ___ (lead) his flock past this very tree.
5. All camera trap data ___ (must / back up) to the cloud at the end of each fieldwork day.
6. She ___ (can't / see) the wolf — she was facing the wrong direction the entire time.
7. The seeds ___ (germinate) slowly over three weeks before the first shoots appeared.
8. How long ___ (the biologists / observe) this particular bird colony before they published their results?
9. The foxes ___ (should / feed) regularly — it is clearly stated in the sanctuary guidelines.
10. The bear ___ (must / eat) enormous quantities before hibernation — look at how large it has become.
🎯 Exercise 3 — Full Advanced Mix
1. The wolf pack ___ (reintroduce) to the national park five years ago, and the ecosystem has changed noticeably since then.
2. The forest floor ___ (cover) in deep snow by the time we arrived at the study site.
3. She ___ (needn't / prepare) three days of food — the trip only lasted one afternoon.
4. By next spring, the wetland restoration project ___ (run) for exactly three years.
5. Pollinators ___ (can / not / replace) by artificial means — it is simply not possible on the scale required.
6. At dawn, while the mist ___ (still / hang) over the valley, we spotted the entire wolf pack.
7. The injured deer ___ (could / save) if we had found it twelve hours earlier.
8. Which of the three nesting sites ___ (the team / use) for the study when the funding was cut?
9. The wolves ___ (must / travel) for days to reach this valley — it is very far from their usual territory.
10. Neither the fox nor the badger ___ (return) to the area after the fire destroyed their burrows.