Tense Consistency in a Narrative

A story picks a home base in time the moment its first verb lands. If a passage opens with 'The crew loaded the boat,' it has promised the reader a past-tense world. Every verb that follows gets read against that promise. One stray present-tense verb in the middle breaks the promise, and the reader has to stop and relocate the scene, which is exactly the jolt that gives the mistake away.

The fix is not to make every verb identical. It is to make every verb answer correctly to the frame. In 'The crew loaded the boat, rowed out, and then sees the whale,' three verbs share one subject doing one connected sequence, so they need one shared tense: loaded, rowed, sighted. But a narrative often needs to talk about something that happened before its main timeline, and that calls for past perfect, not simple past. 'By the time the relief party reached the camp, the stores had dwindled to two kilograms of flour' uses the arrival as the fixed point and places the dwindling behind it in time. Swapping in 'dwindled' would flatten two separate moments into one and blur which happened first.

This is the same logic that governs finite verbs generally: a sentence's main clause needs a verb that is anchored to a time, and every clause hanging off it has to negotiate its own position relative to that anchor. Tense consistency is that negotiation playing out across a whole narrative instead of a single sentence, which is why fixing it means tracking sequence, not matching labels.