到【dào】

到 marks the end point – where a movement arrives, or when an action stops.

到 with a place, then 去 or 来

When 到 introduces a destination before the verb, the sentence usually closes with 去 or 来.

到北京去 and 去北京 both work; the first puts more weight on the destination.

从…到…

到 after a verb

Attached to a verb, 到 says the action reached its target. 看到 is to catch sight of, 听到 to catch the sound, 找到 to find.

The negative is 没, not 不: the action simply did not reach its result.

到 for a time limit