从【cóng】

从 marks where something starts, in space or in time. It goes before the verb, with its place attached.

从 belongs in front of the verb

English puts "from London" at the end of the sentence. Chinese puts it first. wǒ我lái来cóng从Lún dūn伦敦 is wrong.

从…到… for a span

The pair covers a distance or a stretch of time, and both halves keep their place before the verb.

从 against 离

从 is the starting point of a movement; 离 measures the gap between two fixed places. 从这儿到那儿 is a journey; 离这儿很远 is a distance.

Asking where someone is from

This asks about the journey. To ask about origin, 你是哪国人 or 你是哪里人 is the usual question.

从…开始