as though 似乎、好像
【例句】He behaved as though nothing had happened. 他装作若无其事的样子。
【总结】as if/as though的用法
as if 与as though 是一组同义词，两者意思相同，用法也相同，只是在口语中人们多半会用as if, 取其简短。as if和as though用法较为复杂，
（一）在通常情况下，as if 和as though所引导的从句的谓语动词多用虚拟语气，表示所叙述的情况与事实相反。具体用法如下：
Why is she looking at me as though she knew me? 他为什么那样看我？像是认识我似的。
He behaves as if he owned the house. 他的样子好像他拥有这个房子。
It's not as though he was /were poor.
He stood there looking at the train and laughing, as if to miss a train was the best joke in the world.
Mr. Coleman always talked as if he knew everything.
They talked as if they had been friends for years.
（试比较：They had been friends for years.）
Now it is as though she had known Millie for years. （《现代英语用法词典》）
It was as if he had lost his last friend.
"I remember," she tells her children now, "how wild his white hair looked——as if it had been electrified."
必须注意的时，在指过去的动作时，即使主句是现在时，as if 从句中的动词也要用过去完成时：He talks about Rome as though he had been there himself.
He heard a noise, as if someone was breathing.
I felt as if the ground were slipping beneath my feet. 我感到大地仿佛在脚下滑动。
It looked as if it was going to snow.
（二）如果as if后面的从句所表示的情况时真实的或很可能时真实的，则动词可以用陈述语气，在feel, look, seem smell, sound, taste之后尤其如此。试比较：F. T. Wood所着English Colloquial Idioms中的两个例子：
He walks as if he is drunk.
He walks as