the sky looks as if it were to rain.
you looks as if you were to cry.
he looks me as though I am stupid.
He looks at me,as if I am crazy.
his walking looks as if he were drunk.
he is walking as if he were drunk.
It looks as if you just do some running.
It seems as if you come across a ghost.
as if 和as though 意思差不多,能用as if就能用as though