вёл себя так, будто

acted as if

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phrase Rare #43,706
acted as if Used to describe how a male subject behaved, followed by a situation that seemed to be assumed or pretended. The form changes with the subject: вела себя так, будто for a female subject and вели себя так, будто for plural or formal subjects.
RU: Он вёл себя так, будто ничего не слышал.
EN: He acted as if he hadn't heard anything.

Том вёл себя так, будто ничего не произошло.

Tom acted as if nothing had happened.

Том вёл себя так, будто всё знает.

Tom acted as if he knew everything.