The sequence of tenses, as described in Cambridge Grammar, describes the relationship between the tense of a main clause and the tenses of subordinate clauses. It is most relevant in reported speech (where backshift occurs) and in complex sentences with multiple time references. Getting this right is a key differentiator at B2–C1 level.
What Is Tense Backshift?
Backshift is the process of shifting verb tenses one step further into the past when reporting someone's words indirectly, because the reporting verb (said, told, asked) is in the past.
- Direct: “I am tired.” → Reported: She said she was tired. (present → past)
- Direct: “I have finished.” → Reported: He said he had finished. (present perfect → past perfect)
- Direct: “I will help.” → Reported: She said she would help. (will → would)
- Direct: “I was working.” → Reported: He said he had been working. (past continuous → past perfect continuous)
Full Backshift Table
- present simple → past simple
- present continuous → past continuous
- present perfect → past perfect
- past simple → past perfect
- will → would | can → could | may → might | must → had to
When Backshift Is NOT Required
Backshift is often optional or incorrect when:
- Universal truths: He said the earth is round. (not was — still true)
- Still-current situations: She said she lives in London. (still true)
- Informal speech: She told me she loves you. (common without backshift)
Time Expression Changes in Reported Speech
When reporting in the past, time expressions shift: today → that day, yesterday → the day before, tomorrow → the next day/the following day, now → then, here → there, this → that, last week → the previous week.
Sequence of Tenses in Complex Sentences
In complex sentences with two past time references, the earlier action uses past perfect and the later action uses past simple: After she had eaten (earlier), she washed up (later). By the time he arrived, the show had ended.
Common Mistakes
- Wrong: He said he will come tomorrow. Correct: He said he would come the next day.
- Wrong: She said the sun was rotating around the earth. Correct: She said the sun rotates around the earth. (universal truth — no backshift)
- Wrong: After she has eaten, she went to bed. Correct: After she had eaten, she went to bed. (earlier action needs past perfect)
Practice Exercises
Grammar Quiz
Choose the correct backshifted tense in reported speech.
Complete the Sentence
Apply backshift rules to transform direct speech sentences.
Cloze Dropdown
Select the correct tense form in reported speech passages.
Unjumble
Reorder words to form correct reported speech sentences.
Practice What You've Learned
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Frequently Asked Questions
What is tense backshift in reported speech?
Backshift is the process of shifting verb tenses one step further into the past when reporting someone's words indirectly. It occurs because the reporting verb (said, told, asked) is in the past. Direct: "I am hungry" → Reported: He said he was hungry. Direct: "I will call" → Reported: She said she would call. The shift signals that the original statement was made at a different time.
Does tense backshift always happen in reported speech?
No. Backshift is often optional when the information is still true or relevant at the time of reporting. She said (that) she loves Paris. (still true, no backshift needed) Universal truths never backshift: She told us the sun rises in the east (not 'rose'). Backshift is more common in formal writing; in informal speech, no-backshift forms are very frequent.
What is the full tense backshift pattern?
Present simple → Past simple. Present continuous → Past continuous. Present perfect → Past perfect. Past simple → Past perfect. Will → Would. Can → Could. May → Might. Must (obligation) → Had to. These shifts apply when the reporting verb is in the past tense.
What happens to 'must' in reported speech?
'Must' (obligation) typically backshifts to 'had to': "You must leave." → She said I had to leave. However, 'must' expressing deduction can remain as 'must' or become 'must have': "He must be tired." → She thought he must be/must have been tired. 'Must not' usually becomes 'couldn't' or 'was not allowed to' in informal reporting.
Do time expressions change in reported speech?
Yes. When reporting in the past, time expressions shift: today → that day, yesterday → the day before, tomorrow → the next day / the following day, last week → the week before / the previous week, next year → the following year, now → then, here → there, this → that. These changes are important in IELTS and Cambridge sentence transformation tasks.
What is the sequence of tenses in subordinate clauses (not reported speech)?
In complex sentences with two past time references, the earlier action uses past perfect and the later action uses past simple: After she had eaten (earlier), she washed up (later). By the time he arrived, the show had ended. When both actions are narrated as a sequence, past simple can be used for both. Use past perfect when you need to emphasise that one happened before the other.
Are there exceptions to backshift with conditionals in reported speech?
Yes. Second and third conditional structures are often kept unchanged in reported speech to preserve their hypothetical meaning: "If I were rich, I would travel." → She said if she were rich, she would travel. (not 'had been'/'would have travelled'). Preserve the conditional structure when the meaning would be distorted by full backshift.
How does the sequence of tenses work with 'if'-clauses?
In first conditional reporting: "If it rains, I will cancel." → She said if it rained, she would cancel. (full backshift). In second conditional: "If I were you, I would go." → He said if he were me, he would go. (no change possible — already hypothetical). In third conditional: "If she had applied, she would have got it." → No change needed — already past perfect.
What is the difference between 'said' and 'told' in reported speech?
'Say' does not take an indirect object: She said (that) she was tired. NOT She said me she was tired. 'Tell' requires an indirect object: She told me she was tired. She told her students to be quiet. 'Say' can be followed by 'to someone': She said to me that she was tired (more formal). In everyday English, 'She told me...' is much more common than 'She said to me...'.
Is sequence of tenses tested in Cambridge and IELTS exams?
Yes. Backshift is tested in FCE (B2) and CAE (C1) sentence transformation tasks: 'I will call you tomorrow' → She said she would call me the following day. Error correction tasks test incorrect tense use in reported clauses. In IELTS Writing, using reported structures correctly (It has been argued that...) and maintaining tense consistency are assessed in both Task 1 and Task 2.