早知道

zǎozhīdao

If I had known earlier...

I should have known better than to call him.

Source: Tatoeba

Had I known that, I wouldn't have said such a thing to her.

Source: Tatoeba

(bound form) way; reason; principle
(bound form) a skill; an art; a specialization
(Daoism) the Way; the Dao
to say (introducing a direct quotation, as in a novel)
(bound form) to express; to extend (polite words)
classifier for long thin things (rivers, cracks, shadows etc), barriers (walls, doors etc), questions (in an exam etc), commands, courses in a meal, steps in a process
(old) circuit (administrative division)

classifiers: 條, 股