1.It+seem/appear+that ...
It appeared that he was talking to himself.好像他在自言自语。
It seemed that he didn’t recognize me.他似乎没认出我来。
It seemed/appeared that he had made mistakes in his work.好像他在工作中犯了错误。
2.It+系动词+as if/as though ...
It looks as if we are going to have snow.看样子天要下雪了。
She seemed as though she couldn’t understand why Laura was there.
看来她好像不能理解为什么劳拉呆在那儿。
It sounds to me as though there’s a tap running somewhere.
我好像听到某处水龙头流水的声音。