There is a misconception that all verbs in a paragraph should be in the same tense. The choice of the appropriate verb tense depends on context and meaning.

The subject-verb agreement is tricky in a sentence or dependent clause that begins with the words "there, that, which, who," or "what" because they are not real subjects to determine agreement. You ...

Since the expression of future time does not involve any inflecton of the verb, we do not refer to a "future tense". Strictly speaking, there are only two tenses in English: present and past. ASPECT ...

Since the expression of future time does not involve any inflecton of the verb, we do not refer to a "future tense". Strictly speaking, there are only two tenses in English: present and past. ASPECT ...