Speakout B2+. Unit 3, As if/As though

She is smiling as though she ... something funny. (she might remembered something, so she is smiling now)

He seems as if he ... for days (sleep). (it seems that he hasn't slept for days, but he probably has)

She looks as if she ... rich. (she probably is)

He looks as if he ... the answer. (he does know the answer)

You behave as if you ... a child. (but you aren't)

He looks as if he ... the answer. (he gives the impression that he knows the answer, but he probably doesn't)