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If you begin with a verb referring to past time, keep the verb forms in the past. The same rule applies to tenses throughout a composition.
If we are speaking of the result of a past action rather than of the action we must use the present perfect tense. When somebody says, I have seen Panthenon, he or she is not thinking so much of the past act of seeing it, as the present result of that past action.
Use the past participle (and not the past tense) with the auxiliary verb have and its parts.
After the verbs can, must, may, shall, and will, use the infinitive without to , and not the third person of the present.
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