Grammar Essentials (Handbook)

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Subtopic 6 of 8·← Prepositions and conjunctions·Degrees of comparison and question tags →

Modals, conditionals and the subjunctive

Modals: always followed by the base verb (V1)

Modal	Main uses	Example
can / could	ability; could = past ability or polite request	She can* swim. Could you help me?*
may / might	permission; possibility (might = less likely)	May I come in? It might rain.
must	strong obligation; logical certainty	You must* wear a helmet. He must be tired.*
should / ought to	duty, advice (ought always takes to)	You ought to* respect elders.*
will / shall	future; shall for offers with I/we	Shall I open the window?
would	past habit; polite request; conditional	He would* walk daily as a child.*
need / dare (as modals)	only in negatives/questions, no to, no -s	He need not* come. Dare he argue?*
used to	past habit that no longer exists	I used to* play chess.*

Modal + V1 only: He can speaks ✗; She must to go ✗.
be used to / be accustomed to + V-ing (= familiar with): I am used to working late ≠ I used to work late.
had better + V1: You had better leave now. would rather + V1: I would rather stay.

Perfect modals (modal + have + V3) talk about the past

Form	Meaning	Example
must have + V3	confident deduction	The ground is wet; it must have rained.
can't have + V3	confident negative deduction	He can't have finished* so soon.*
should have / ought to have + V3	duty not done (regret/criticism)	You should have told* me.*
could have + V3	possible but did not happen	We could have won.
may / might have + V3	possibility about the past	She may have missed* the bus.*
needn't have + V3	did it, but it was unnecessary	You needn't have brought* gifts.*

Conditionals

Type	If-clause	Main clause	Meaning	Example
Zero	present	present	general truth	If you heat ice, it melts.
First	present	will + V1	real future possibility	If it rains, we will stay* in.*
Second	past (were for all persons)	would/could/might + V1	unreal present/future	If I were* rich, I would travel.*
Third	had + V3	would/could/might + have + V3	unreal past	If he had studied, he would have passed.

Never put will or would in the if-clause of these patterns: If he would have come ✗ → If he had come.
Inverted conditionals drop if: Had I known = If I had known; Were I you = If I were you; Should you need help = If you need help.
unless = if not, so it never takes another not: Unless you hurry, you will miss the bus.
Mixed conditional: If I had taken the job, I would be in Mumbai now (past condition, present result).

Subjunctive (unreal or desired situations)

wish + past (present wish) / past perfect (past regret): I wish I were taller; I wish I had listened.
as if / as though + past / were: He talks as if he were the boss.
It is (high/about) time + past: It is time we went home.
suggest, recommend, insist, demand, propose, order, request + that + subject + (should) V1: The doctor suggested that he take / should take rest (not takes).
would rather + subject + past: I would rather you stayed here.

📖 Notes 🧩 4 question types 🎯 12 practice Q

Detailed notes

Modals: the base-verb rule

After a modal — can, could, may, might, shall, should, will, would, must — the main verb is always the base form (V1): never to + V1, never -s, never -ing.

He can speak three languages (not speaks).
You should consult a doctor (not to consult).
She need not say anything (need not + V1).

What each modal means

Modal	Main job	Example
can / could	ability; could = past or polite	I can swim. Could you help me?
may / might	permission; possibility	May I come in? It might rain.
should	duty, advice, criticism of the past (should have + V3)	You should apologise.
must	strong obligation; strong deduction (must have + V3)	You must wear a helmet.
used to	past habit, now stopped	I used to play cricket every evening.

Perfect modals: look back at the past

modal + have + V3 judges or deduces a past action:

must have + V3 → sure deduction: The road is wet; it must have rained.
should have + V3 → it was right but not done: You should have taken my permission.
could have + V3 → it was possible but did not happen: He could have won with more practice.

Conditionals: the four patterns

Type	If-clause	Main clause	Example
Zero	simple present	simple present	If you heat ice, it melts.
First (real)	simple present	will + V1	If it rains, the match will be postponed.
Second (unreal present)	simple past	would + V1	If I were you, I would apologise.
Third (unreal past)	had + V3	would have + V3	If he had prepared well, he would have passed.

The planted errors: will in the if-clause, was for the second conditional (exam answer: were), and would in the third conditional's if-clause (correct: had + V3).

Attack method

Spot the modal or the if-clause first.
Apply the base-verb rule, or read off the conditional row.
For perfect modals ask: is the speaker deducing the past (must have) or finding fault with it (should have)?

The two rules that settle most items in seconds: after any modal, the next verb is bare V1; and whatever the if-clause takes, the main clause never repeats it. If the if-clause has had + V3, the main clause must show would have; if the if-clause already says would, the sentence is wrong by default.

Quick revision

Modal + V1 always: can speak, should consult, need not say.
must have = sure past deduction; should have = past fault; could have = missed possibility.
First: if + present, will + V1. Second: if + past, would + V1 (were). Third: if + had V3, would have + V3.
used to = past habit.

Types of questions asked

Every way this subtopic shows up in exams — how to recognise it, the formula or logic to use, and a solved example.

Type 1: Modal + base verbvery common3 practice Q

How to spot it:

A modal is present and the options offer to + V1, V1, V-ing or V-s forms.

Confirm a modal (can, should, must, need not) governs the verb.
Strip everything but the base form V1.
Reject to-infinitives and -s/-ing forms.

Why it works: modals themselves carry the tense, so the main verb stays bare.

Example: You should ___ a doctor immediately. (consult/to consult/consulting/consults)

should + V1 → consult; 'to consult' is the planted error.

Type 2: Perfect modal of judgementcommon2 practice Q

How to spot it:

The sentence looks back at a past action (the road is wet; you look exhausted) and the options are must/should/could + have.

Ask the speaker's purpose: deduce surely (must have), find fault (should have), note a missed chance (could have).
Match the option.
Keep have + V3 after the modal.

Why it works: the three perfect modals split the past into three speaker attitudes.

Example: You ___ have taken my permission before using my laptop.

Fault-finding about the past → should have taken.

Type 3: Conditional sentence patternsvery common3 practice Q

How to spot it:

An if-clause is present and the options mix will, would, had + V3 and would have + V3.

Decide reality: true/likely (first), imaginary present (second), imaginary past (third).
Read off the row: present + will; past + would; had + V3 + would have + V3.
Use were (not was) in the second conditional.

Why it works: each conditional is a fixed two-part formula; one half decides the other.

Example: If I ___ you, I would apologise at once. (were/was/am/had been)

Unreal present → second conditional → were.

Type 4: Modal choice: permission, habit, possibilitycommon2 practice Q

How to spot it:

The sentence is a polite request, a past habit, or a prediction with varying certainty.

Request → may/can; past habit → used to; certainty ladder: must > may/might > could.
Match the politeness or certainty level the sentence signals.
Reject modals of the wrong strength.

Why it works: modals encode the speaker's certainty and politeness, so the sentence's tone picks one.

Example: When I was young, I ___ play cricket every evening. (used to/am used to/was used to/use to)

Stopped past habit → used to.

Shortcut tricks

⚡ If-clause match table

Read the main clause first, then fix the if-clause: will → present; would + V1 → past/were; would have + V3 → had + V3. The if-clause is always one step 'further back' in time than the main verb.

Example: If she ___ (leave) earlier, she would have caught the flight.

Main clause would have caught → third conditional → had left.

⚡ Deduction ladder

Certain positive → must have; certain negative → can't/couldn't have; unsure → may/might have; duty missed → should have. Evidence words (wet road, empty plate, lights off) point to must have.

Where students lose marks

Using to after a modal (must to go) or -s after a modal (can speaks).
Writing would in the if-clause: If I would know....
Using was instead of were in the formal subjunctive (If I was you is informal).
Confusing used to + V1 (past habit) with be used to + V-ing (familiar).
Writing suggested that he takes instead of (should) take.
Using needn't to or doesn't need go.

Practice sets — 12 questions

Sets of 10, mixed across the question types above. Each answer comes with a step-by-step explanation.

Topic test · 12 questions

Suggested time 6 min · wrong answers go to your mistake notebook automatically.