PASO 1Elige la opción correcta
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Express an improbable condition by the past tense and use the conditional in the main clause. This use of the past tense doesn't indicate a time but a degree of probability.
Use the past perfect when the time of one past action is more past than that of another. Put the action which was completed first in the past perfect and the second action in the past tense.
Don't use the present tense and the past perfect in the same sentence. It would be incorrect to say: My brother says that he had not gone to the cinema last night.
Use the past tense after the phrase as if or as though. He talks as if he knew everything, means He talks as he would talk if he knew everything.
Use the subjective were with the verb to be after as if: He acts as if he were a rich man.
Will changes to would in subordinate causes, when the verb in the main clause is in a past tense.