四、作無人稱代詞的主語，表時間、天氣、距離、溫度、環(huán)境和情況。It was noisy when I got to the room.

　　五--表含糊概念，無補語，指從句敘述內(nèi)容。

　　I hate it that I've made so many mistakes.

　　I hate it when you can't discuss things openly.

　　How is it in the market? 超市情況如何？

　　六----強調(diào)句中使用"It is/was+強調(diào)部分 （主語，賓語等）+that/who+其余部分"。如果強調(diào)的是特殊疑問句，表示"究竟，到底"等語氣時，就用結(jié)構(gòu)："疑問詞+is/was it that +句子"，如：Where was it that you met him? What is it that he wants to see? When was it that you saw him?

　　Why is it that you want to change your idea?

　　這類強調(diào)句也可用作表語或賓語。The question is which book it is that you want to buy.

　　He found out who it was that saved the drowning boy.

　　如果強調(diào)謂語，謂語動詞部分的語氣用do，does，did，常譯作"的確，千萬，真的"

　　Do be patient! 千萬要耐心！He does speak English well。He said he would come and did come.

　　七、作形式賓語

　　a) 謂語動詞appreciate, dislike, like, hate, love, make (按時到達，成功)等后接由if或when 等引導(dǎo)的賓語從句時，往往在前面加上形式賓語it。 I would appreciate it if you could come to my birthday party.

　　2、動詞have（表明，堅持說）、take（認(rèn)為，猜想）、hide（隱藏）、publish（公布）、put（表達，寫出來）等后接由that引導(dǎo)的賓語從句時，往往在從句的前面加上形式賓語。I take it that you will be leaving Shanghai soon.我認(rèn)為你不久就離開上海。

　　We published it that we had finished the project ahead of time. 我宣布我們已經(jīng)提前完成了這項工程。

　　3、 動詞短語allow for（擔(dān)保）、count on（期待）、depend on（依靠）、insist on（堅持）、see to（確保）等后接that引導(dǎo)的賓語從句時，必須冠以形式賓語it。 如：I am counting on it that you will come. 我們期待著你的到來。

　　She'll see to it that he goes ahead。 她確保讓他先走。