6. 介词前提比介词结尾的句子正式。
He is a person on whom we can rely (whom we can rely on).
With what did he write it? (What did he write it with?)

7. 情态动词
1) 用于请求时，`May‘ 比 `can‘ 正式。 May (Can) I use your bike?
2) 用于请求时，`Would‘ 和 `Could‘ 比 `will‘ 和 `can‘ 正式。 Would /Could ( Will/Can) you like to give a speech?

8. 泛指时定冠词比名词复数正式。
The horse is a very useful animal.
(Horses are very useful animals.)

9. 从句比不定式的形式正式。
It is important that we should do it (for us to do it).
It seems that he is a teacher. (He seems to be a teacher.)

10. 其它的一些句子。
1) If you come early, you will see him. (Come early and you will see him.)
2) I shall try and do it. (I shall try to do it.)
3) He is so young that he can not dress himself.
(He is too young to dress himself.)
4) It is so beautiful a city. (It is such a beautiful city.)
5) Haven‘t you heard the news? (Have you not heard the news?)
6) To my surprise, I hear the news. ( I‘m surprised to hear the news.)
7) We starts for Beijing tonight. (We are starting for Beijing tonight.)
8) To begin with, (First ) we must consider this thoroughly.
9) I go to see my old friend occasionally (now and then).
10) I am hence (therefore) unable to help you.
11) By the way, (Incidentally) do you know something about this?
12) I was ill therefore (so) I could not come.
13) He spoke loudly in order that (so that) every one could hear him.
14) You should work hard even though (even if) you have made great progress.
15) They asked me whether (if) they would come.
16) He still works hard although (though) he is old.
17) He took his umbrella lest (for fear that ) it should rain.
18) Don‘t come otherwise (or) I shall fire.
19) He failed to go there on account of (because of ) the rain.
20) He works hard despite (in spite of) his old age.
21) In my opinion (I think) he is not correct.
22) He got up early in order to (so as to) have more time to study.
23) He went there once per (a) day.
24) Many (lots of) people get much ( a lot of ) pleasure from music.
25) He has little (not much) money and few (not many) friends.
26) I fear (am afraid) that he will not come.
27) I have to (have got to ) see my friend.
28) Phone me again within (in) a weak.
29) What on earth (in the hell) are you doing?

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