Grammar / usage: Tense agreement across clauses
Subtopic: Section D · Grammar
How to structure your answer
Rule: within a complex sentence, the verb in the subordinate clause is selected by the time relation to the main clause, not by the clock time of the writer. When the main verb is in the past, the subordinate verb typically moves one step back ('He said that he was busy'); when the main verb is in the present or future, the subordinate verb takes whatever tense the meaning requires. Three exceptions to the back-shift survive: universal truths, habitual actions, and historical present.
Approach: identify the main verb's tense first; then ask whether the subordinate event is earlier, simultaneous or later; pick the tense that signals that relation. Time adverbs ('yesterday', 'usually', 'tomorrow') anchor tense and should not be ignored.
What an examiner expects: the rule stated in one sentence; corrected sentences with the verb change underlined; a one-line justification per sentence.
Common pitfalls: (1) failing to back-shift after a past main verb; (2) over-back-shifting universal truths; (3) ignoring perfect tenses, which signal sequence ('had + past participle' for the earlier of two past events).
Detailed model answer
122 words · target 100 words · 8 min
Rule: Tense in a subordinate clause normally follows the tense of the main clause: a past main verb pulls dependent verbs into a past form; a present or future main verb leaves them free.
Worked examples: 'He said he was ready' (not is: past main → past dependent). 'She knows that he has arrived' (present main → present perfect retained). 'I will tell you when he arrives' (future main → present in time clause).
Quick check:
- She told me that she (is/was) leaving. was
- He believes that honesty (is/was) the best policy. is (universal truth)
- I knew that they (will/would) help. would
- She will call as soon as she (reaches/will reach) home. reaches
- He admitted that he (forgot/had forgotten) the date. had forgotten
What an examiner expects to see
- Rule: subordinate verb agrees in time-relation with main verb.
- Past main → past subordinate (default back-shift).
- Present main → any tense the meaning requires.
- Future main → present in subordinate after 'when', 'if', 'as soon as'.
- Exception 1 — universal truths stay in present ('She said the earth revolves around the sun').
- Exception 2 — habitual present actions stay in present ('He said he walks to work').
- Exception 3 — historical present once chosen, must be consistent.
- Past perfect ('had + past participle') signals the earlier of two past events.
- Time adverbs anchor tense — never ignore 'yesterday', 'usually', 'tomorrow'.
- Practice sentences for the examinee to correct.
Concrete cases, schemes and judgments
- Wrong: 'When he arrives, I went home.' Right: 'When he arrived, I went home.' (past anchors both clauses.)
- Wrong: 'She told me she will come tomorrow.' Right: 'She told me she would come the next day.' (back-shift after past main verb.)
- Wrong: 'After he ate dinner, he goes for a walk.' Right: 'After he ate dinner, he went for a walk.' (consistent past.)
- Wrong: 'The teacher explained that water boiled at 100 degrees.' Right: 'The teacher explained that water boils at 100 degrees.' (universal truth — exception to back-shift.)