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Changing verb tenses when reporting speech.
Backshift is the change from a present or future form to an earlier-looking form when speech is reported from a past viewpoint.
Backshift is common when the reporting verb is in the past, but the choice depends on the relationship between the original statement and the reporting context.
A Present Simple form commonly changes to the Past Simple when a statement is reported after a past reporting verb.
For example, "I work here" becomes She said that she worked there.
A Present Continuous form commonly changes to the Past Continuous in reported speech after a past reporting verb.
For example, "I am working" becomes He said that he was working.
A Present Perfect form commonly changes to the Past Perfect in reported speech after a past reporting verb.
For example, "I have finished" becomes She said that she had finished.
A Present Perfect Continuous form commonly changes to the Past Perfect Continuous.
For example, "I have been waiting" becomes He said that he had been waiting.
A Past Simple form can change to the Past Perfect when reporting a past event from a later past viewpoint.
For example, "I saw John yesterday" can become She said that she had seen John the day before.
A Past Continuous form can change to the Past Perfect Continuous when the reporting perspective requires a further step back in time.
For example, "I was waiting" can become He said that he had been waiting.
Past Perfect and Past Perfect Continuous normally do not undergo further backshift in ordinary reported speech.
For example, "I had finished" becomes She said that she had finished.
Will commonly changes to would when a future statement is reported from a past viewpoint.
For example, "I will call you" becomes He said that he would call me.
Can commonly changes to could when its meaning is appropriate and the original statement is reported from a past viewpoint.
For example, "I can help you" becomes She said that she could help me.
May can change to might when reporting a possibility from a past viewpoint.
For example, "It may rain" becomes He said that it might rain.
Must can remain unchanged or be replaced by a different expression depending on whether it expresses deduction, obligation, or necessity.
For example, "You must leave" can be reported as He said that I had to leave when the meaning is obligation.
Shall may change to would or should in reported speech depending on its original meaning and grammatical function.
For example, "I shall return" may become He said that he would return, while "Shall I open the window?" may be reported as She asked whether she should open the window.
Could, might, should, and would normally do not undergo another backshift simply because the reporting verb is in the past.
For example, "I might come" can become She said that she might come.
Will be + -ing commonly changes to would be + -ing when reported from a past viewpoint.
For example, "I will be working tomorrow" becomes He said that he would be working the next day.
Will have + past participle commonly changes to would have + past participle in reported speech from a past viewpoint.
For example, "I will have finished by Friday" becomes She said that she would have finished by Friday.
Be going to commonly changes to was or were going to when reporting a future intention or prediction from a past viewpoint.
For example, "I am going to leave" becomes He said that he was going to leave.
The same backshift patterns apply to negative statements as to affirmative statements.
For example, "I do not know" becomes She said that she did not know, while "I have not finished" becomes He said that he had not finished.
Reported questions can involve the same tense backshift patterns as reported statements.
For example, "Are you working?" becomes He asked whether I was working, and "Have you finished?" becomes She asked whether I had finished.
The tense backshift system is generally not applied to infinitive-based reported commands and requests in the same way as to statements.
For example, "Close the door" becomes She told me to close the door, not She told me that I closed the door.
Backshift may be omitted when the reported information is still true or remains relevant at the time of reporting.
For example, "The Earth is round" can be reported as He said that the Earth is round.
General facts and permanent truths often remain in the present tense in reported speech.
For example, The teacher said that water boils at 100°C.
Backshift is usually unnecessary when the reporting verb is in the present or present perfect and the context does not require a change of viewpoint.
For example, She says that she is tired and He has said that he does not agree.
Backshift reflects the reporter's viewpoint rather than functioning as an automatic grammatical transformation in every context.
The decision to backshift depends on the relationship between the original utterance, the reporting time, and whether the information remains current.
Apply backshift consistently when it is appropriate and avoid changing tenses mechanically when the context does not require it.
Common mistakes include failing to backshift ordinary past reporting, backshifting permanent truths unnecessarily, changing modals such as would or might again, and confusing backshift with simple past-time reference.