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The subjunctive, despite sometimes being referred to as a tense, is in fact a mood. The reason for this is because it's used by speakers to express actions depending on certain factors. These factors can ...

The imperfect tense should be used when: describing something one did in the past on a regular basis; setting the stage for another action (i.e. i was reading when he came in, leía cuando en...

It depends on the context and sentence. But, as a general rule, you use the preterite when you're talking about an action that had a clear start and a clear end. An example of that would be 'Paul taught h...

There are 6 irregular verbs in the present subjunctive tense; dar, ir, ser, haber, estar, saber.

The conjugations are as follows:

Dar: dé, des, dé, demos, deis, den

Ir: vaya, vayas, v...

Los gases de efecto invernadero que son producidos por la contaminación circulan en la atmósfera, así que no importa el país que los produce.