CDS English · Grammar
Conditionals, tenses and verb forms in blanks
Many blanks ask for the right form of a verb. The words around the blank (if, had, since, scarcely, a modal, is) decide the form, so find those signal words first.
Why this matters
These items look like vocabulary but are pure grammar. Four options often differ only in tense or form (started, had started, would start, has started). Each signal word allows only one form, so a short checklist turns them into sure marks.
Concept 1 of 4: The three conditionals and inverted 'Had he'
Definition
The terms:
- First conditional (a real future possibility): If + present, will + base verb. If it rains, we will stay in.
- Second conditional (an imagined present or future): If + past, would / could + base verb. If I had wings, I would fly.
- Third conditional (an imagined past): If + had + past participle, would / could have + past participle. If he had run, he would have won.
- Subjunctive were: in an imagined condition, use were for every subject: If I were you.
- Inversion: drop if and put had first: Had he run = If he had run.
The method:
- Find the printed half and identify its form (will? would? would have?).
- Give the blank the matching form from the list above.
- Never put will or would in the if-half.
Items tested this way:
- If Mohan had started at 5 a.m., he would not have missed the train (2017 II)
- If I were you, I would love to accept the offer (2018 II)
- Had I been informed beforehand, I could have made it to the celebrations (2021 I)
- Had he told me the news beforehand, I would have been careful (2022 II)
- If a Time Machine could take you anywhere, where would you go? (2022 II)
- I shall not be going to the theatre if it snows (2024 I)
Worked example
Practice this conceptself-check · 4 quick reps
The same idea in a real exam question:
Example 1 · Grammar · Connector Blanks: Conditionals and Verb Forms
No would in the if-half
Inversion drops the if
If I were, not if I was, in an imagined condition
Concept 2 of 4: Tense signals and subject-verb agreement
Definition
The rules:
- since / for + an action still going on → present perfect (continuous): He has been waiting since morning.
- lately, recently, ever, yet → present perfect: Have you seen him lately?
- yesterday, last year, in 2010 → simple past: I saw him yesterday.
- Scarcely / Hardly at the start → had + subject + past participle ... when: Scarcely had he left when it rained. (No sooner had ... than.)
- Reported speech: after a past reporting verb (told, said, asked), move the tense back: will → would, am → was or were.
- Agreement: a singular subject takes a singular verb (He has), a plural subject a plural verb (They behaved, They have).
- Plural sense: a quantity like twelve dozen takes a plural verb (twelve dozen cost); politics meaning political affairs or opinions takes are.
- Time clauses match the main clause: When she met her friend, her throat choked (both past).
Items tested this way:
- Scarcely had the teacher entered the class when he heard the noise (2018 I)
- When she met her friend after two decades (2021 I); She told me that she would have completed her degree by 2023 (2021 I)
- My sister asked me if I were willing (2018 II); He has been waiting for you since morning (2022 II)
- Have you seen Mohan lately? (2023 I); twelve dozen cost one hundred rupees (2022 I)
- The country's politics are complex (2024 II); They behaved as responsible people do (2023 II)
Worked example
Practice this conceptself-check · 4 quick reps
The same idea in a real exam question:
Example 2 · Grammar · Connector Blanks: Conditionals and Verb Forms
Scarcely ... when, not scarcely ... than
Present perfect never sits with yesterday
A plural-looking subject can be one idea, and the reverse
Concept 3 of 4: Verb form after a modal, a verb or 'is': base, gerund, participle, passive
Definition
The terms:
- Modal: can, could, should, must, may, need. It is followed by the base verb (should leave).
- Gerund: the -ing form used as a noun (enjoy swimming, dislike having to wait).
- Past participle: the third form (written, affected, expected).
- Passive: be + past participle, when the subject receives the action (The report is written by him).
The method:
- After a modal → base verb.
- After enjoy, dislike, avoid, mind, finish, try (meaning test out) → -ing.
- After is / are / was / were, if the subject does not do the action → past participle.
- needn't = it is not necessary; mustn't = it is not allowed.
Items tested this way:
- your brother needn't go just yet (2018 I); Davis is not sure whether he should leave (2023 II)
- Honesty is written on his face (2021 II); Reading ability is affected by speech disorders (2024 I); The damage is expected to be extensive (2024 II)
- Have you ever tried climbing a coconut tree? (2021 II); He dislikes having to punish his friends (2021 II)
Worked example
Practice this conceptself-check · 4 quick reps
The same idea in a real exam question:
Example 3 · Grammar · Connector Blanks: Conditionals and Verb Forms
Affect is the verb, effect is usually the noun
Is expecting or is expected?
Needn't and mustn't are not the same
Dislike having to, not dislike have to
Concept 4 of 4: Relative pronouns and comparisons
Definition
The terms:
- Relative pronoun: who (people, as subject), whom (people, as object or after a preposition), whose (belonging), which (things).
- Comparative: the -er or more form (better, greater, more than). It is followed by than.
The rules:
- whose + noun shows belonging: the person whose daughter married your cousin.
- After a preposition use whom or which: four of whom were armed.
- too + adjective + to + verb = more than enough to stop the action: too good to be true. (so ... that is the other frame.)
- than any other + singular noun when one item is compared with the rest of its own group.
- one of the + plural noun: one of the well-known journalists.
Items tested this way:
- the person whose daughter married your cousin (2021 I); a group of men, four of whom were armed (2024 II)
- The news is too good to be true (2022 I); There is nothing better than a busy life (2022 I)
- The portrait conveys more than it appears (2021 I); greater than any other city in India (2022 II)
- one of the well-known journalists in the country (2022 II)
Worked example
Practice this conceptself-check · 4 quick reps
The same idea in a real exam question:
Example 4 · Grammar · Connector Blanks: Conditionals and Verb Forms
Than any other, not than any
One of the + plural noun
Who after a preposition becomes whom
What cannot follow a noun
Summary — formulas & gotchas at a glance
A revision cheat-sheet for the formulas and gotchas above. Click any concept name to jump back to its full explanation.
Watch out for (14)
- No would in the if-half→ The three conditionals and inverted 'Had he'
- Inversion drops the if→ The three conditionals and inverted 'Had he'
- If I were, not if I was, in an imagined condition→ The three conditionals and inverted 'Had he'
- Scarcely ... when, not scarcely ... than→ Tense signals and subject-verb agreement
- Present perfect never sits with yesterday→ Tense signals and subject-verb agreement
- A plural-looking subject can be one idea, and the reverse→ Tense signals and subject-verb agreement
- Affect is the verb, effect is usually the noun→ Verb form after a modal, a verb or 'is': base, gerund, participle, passive
- Is expecting or is expected?→ Verb form after a modal, a verb or 'is': base, gerund, participle, passive
- Needn't and mustn't are not the same→ Verb form after a modal, a verb or 'is': base, gerund, participle, passive
- Dislike having to, not dislike have to→ Verb form after a modal, a verb or 'is': base, gerund, participle, passive
- Than any other, not than any→ Relative pronouns and comparisons
- One of the + plural noun→ Relative pronouns and comparisons
- Who after a preposition becomes whom→ Relative pronouns and comparisons
- What cannot follow a noun→ Relative pronouns and comparisons
Test yourself on Grammar
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