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Express a counterfactual (that didn't happen) condition by the past perfect and use the past conditional in the main clause. This use of the past perfect doesn't indicate a time but an impossible happening.
Use the present infinitive without to, not the past tense after the auxiliary did.
the answer to a question beginning with did is always in the past tense: Did you see the picture? -Yes, I saw the picture; or Yes, I did.
If we are speaking of an action just finished, we must use the present perfect instead of the simple past tense. For example, immediately after the clock strikes, we shouldn't say The clock struck, but The clock has struck.
When the verb in the main clause is in the past tense, use a past tense in subordinate clauses.
This rule doesn't apply (1) to verbs within quotations, (2) to facts that are true at all times. We say:
1. She said, 'I am waiting for your answer'
2. He said that London is a great city