请问如何判断as if/though引导的是表语从句还是方式状语从句?是不是看它前面的词是否为系动词?

没错,如果从句前面是look,seem之类的系动词,则为表语从句.
如果不是,则为方式状语从句了.
如：It looks as if it's going to rain.表语从句
He told me everything as if I were his close friend.方式状语从句
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