As if, as though, as, the way and like
We use as if/as though to say what a situation seems like
It looks as if/as though I was dying
We can use a past tense with a present meaning this shoes that a comparison is unreal.
She looks as if/as though she’s rich. (Perhaps she is)
He talks as if/as though he is rich. (He is not rich)
You look as though/as if you know each other
Why is she looking at me as if she knows me? I’ve never seen her before
He talks as if/as though he was rich (formal)
Like is used instead of as if/as though epically American English, this is considered incorrect in formal style.
Its look like its going to rain
He sat there smiling like it was his birthday
Like Jane, I don’t smoke We don’t smoke
I don’t smoke, like Jane I don’t smoke but Jan yes
A comparison with as /like after negative clause refers only to the positive part comparison with as/like before a negative clauses refers to the whole clause