补充拓展： as if = as though 似乎，好像 He behaved __________ nothing had happened. only if 只要（条件，只有……才） 只要你和我一起，我就回家。 I will come home only if you come with me. If only 要是……就好了（愿望） 要是他们在这，我们就可以为他们举办一个结婚纪念。 If only they were here now, we would be able to celebrate their wedding anniversary. Z.xxk

as if/ though