PASO 1Elige la opción correcta
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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.
May changes to might in subordinate clauses, when the verb in the main clause is in the past simple tense.
The conjunction that is never preceded by a comma.
Don't use the past perfect unless there is another verb in the past tense in the same sentence.
Use the simple past tense (and not the present perfect) for an action complete in the past at a stated time.
When a sentence has a word or a phrase denoting past time, like yesterday, last night, last week, last year, then, ago, etc., always use a simple past tense.
The verb to use doesn't express a habit in the present. I use means I employ: I use a pen to write with.
Used to expresses a past state or habit and it usually refers to some old situation which no longer exists: I used to see him every day; My father used to play football very well.