Big Deal Thinks I Passing Driver's Test Tonight

"Passing my driver's test was no big deal."
"He thinks he is such a big deal."
"It's no big deal if we don't go tonight."

A. "I think I might have lost that screwdriver you let me borrow last week."
B. "It's no big deal, I have another one."

Other Common Sentences

"He thinks he is all that matters."
"It's not that important."