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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.
Can changes to could in subordinate clauses, when the verb in the main clause is in the past simple tense.
After the auxiliary does use the infinitive without to, and not the third person of the present.
The answer to a question beginning with Does is always in the present tense, third person: Does he like the cinema? - Yes, he likes the cinema; or Yes, he does.