He seems to be lying.

The idea occurred to me that he was lying.

He turned out to be nothing but a liar.

I suspect him to be a liar.

He was at the airport to meet Mr West.

He doesn't even drink beer, not to mention whiskey.

He is, so to speak, a walking encyclopedia.

He is, so to speak, a grown-up baby.

He is a wise fool, so to speak.

He is, so to speak, a learned fool.