as if 用法歸納：
as if一般可由as though來代替。可在look, seem等系動詞後引導表語從句。如:
It seems as if it is going to rain.
看來好像要下雨了。
as if 從句的語氣及時態
當説話者認為句子所述的是真實的`或極有可能發生或存在的事實時,as if從句用陳述語氣。如:
It sounds as if it is raining.
聽起來像在下雨。
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