As if and as though are used to say how someone or something sounds, looks, feels etc.
As if and as though can also be used with it sounds, it looks, it smells etc.
With an it structure, like can be used instead of as if or as though.
Such as can be used with a noun.
As if can also be used with other verbs to say how someone does something..
After as if the past tense is sometimes used when talking about the present. The meaning is not past, it has the sense of not being real.
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