从句表示与将来事实相反，谓语动词用“would／could／might＋动词原形”。
例句：
Her head felt as if it would burst.
她觉得头要爆裂了。
He made as if to speak.
他似乎要说点什么。
I don't feel as if I belong here.
我在这里感觉格格不入。
I felt as if my heart had stopped.
我觉得好像我的心都不跳了。
I can remember our wedding as if it were yesterday.
我们的婚礼我记忆犹新，就像昨天一样。