It 代替動(dòng)名詞短語時(shí)：

　　We thought it no use doing that.

　　我們認(rèn)為那樣做無濟(jì)于事。

　　Our teacher thinks it no good learning without practice.

　　我們的老師認(rèn)識(shí)光學(xué)不實(shí)踐是沒有好處的。

　　It 代替賓語從句時(shí)：

　　I think it very important that we take part in the discussion.

　　我認(rèn)為我們參加這次討論是很重要的

　　Didn't I make it clear to you that I was not coming?

　　我不是向你明確表示過我不來了嗎？