从来不 / 从来没(有) / 从来都【cónglái bù / cónglái méi(yǒu) / cónglái dōu】

从来 means "at any time, ever". It almost always comes with a negative, and together they mean "never". The negative decides which "never" you get.

从来不 or 从来没

从来不 is about habit or choice: something someone doesn't do, as a rule. 从来没 says something has never happened, and the verb takes 过.

• × 我从来不去过上海 → 我从来没去过上海
• × 他从来没喝酒 → 他从来不喝酒 / 他从来没喝过酒

从来都 for "always"

Without a negative, 从来 needs 都 (or 就) after it, and the meaning turns to "always, all along".

• × 他从来很准时 → 他从来都很准时

从来 goes after the subject, before the negative. It doesn't open a sentence the way "never" can in English.

• × 从来我没见过他 → 我从来没见过他