Is present tense always perfect tense or can there be imperfect present tense? What about future tense? Is future tense perfect tense or imperfect? Can it be both?

Answer 1

See explanation.

The tenses can be either perfect or imperfect - no matter if they are present, past or future.

A perfect tense is a tense which describes a finnished action.

Example:

Present Perfect tense is (as its name suggests) a perfect tense; it means that this tense describes an action completed in the near past which has its influence on the present situation.

An imperfect tense describes an action which is not completed.

Example:

Continuous tenses (also called Progressive) describe unfinnished actions, so they are imperfect ones.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.