если бы знал

if he knew; if I had known (with a masculine subject understood from context)

→ если

phrase Rare #25,426

if he knew; if I had known (with a masculine subject understood from context) A conditional phrase meaning “if [someone] knew” or, in past contexts, “if [someone] had known.” The form знал is masculine singular past tense; it changes according to the subject, such as знала for a feminine subject and знали for a plural or polite subject.

RU: Он сказал бы нам, если бы знал.

EN: He would have told us if he had known.

Я уверен, что Том бы мне сказал, если бы знал.

I'm sure Tom would tell me if he knew.

Он сказал бы нам, если бы знал.

He would tell us if he knew.

Но возможно я бы мог помочь, если бы знал.

But maybe I could help if I knew.

— На холостом ходу (1988)

Полагаю, что он сказал бы мне, если бы знал об этом.

I suppose he would tell me if he knew about it.

— Жить (1952)

Том сказал бы нам, если бы знал.

Tom would tell us if he knew.

Я бы сам это сделал, если бы знал как.

I would have done it myself if I had known how.