- Context. See the example below.
- Context.
- Historical present happens on per-sentence basis (i.e., it's about the tense of the main verb usually at the end of each sentence). When you see mixed tense within one sentence, that's probably related to relative tense.
- Historical present happens in English novels, but it's probably more common in Japanese novels. If you feel there are too much historical present in Japanese text you're trying to translate, you may want to translate some of the sentences into English using past tense.
Historical present is something shown below (pink). See how this author switched tense very frequently at the end of each sentence. Also note that the verbs in subordinate clauses (green) are not related to historical present; they have nothing to do with "vividness".