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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.
The verb after a since clause of time is generally in the present perfect tense.
Can changes to could in subordinate clauses, when the verb in the main clause is in the past simple tense.
Use the present perfect (and not the simple present) for an action begun in the past and continuing into the present. I've been at this school two years means I'm still here.
Use the simple present (and not the present continuous) to express a present habitual action.
Use the present continuous to express a habitual action with the word always or with a verb denoting a continuous state: He is always talking in class; He is living in London.