It +be
谈论天气 “ It's going to rain.” 说到时间 “It's time to go to school.”
距离远近 “It's far to get there.” 情况程度 “It's hard to learn.”
连词的用法
一、并列连词：
1. and 连接单词 My brother and I study in the same school.
连接短语 Our knowledge may come from the books and from practice.
连接句子 We are singing and they are dancing.
2. but 但是/而是 I have a pen but no pencil.
or 或者 Will you go there by bus or on foot?
3.nothing but 除了，只有 I did nothing but watch it.
4.or表示否则 Hurry up or you will be late.
5.for 表示因为 He is good at math for he studies harder than others.
6.still 表示后句概念由前句转折而来
The weather is very cold, still we needn’t wear more clothes.
7.not only…but also 不仅…而且 可并列主、谓、宾、表及句子
主语并列时，谓语要就近一致 Not only he but also I am a teacher.
8.as well as 以及，同样 并列单词、短语、句子。
并列主语时，动词要随前面的主语变化 He works as well as he can
9.either…or 既…又…，或…或… 并列主、谓、宾、表及状语 Either come in or go out.
10.neither…nor 既不…也不 并列主、谓、宾、表、状语，
并列主语时，谓语就近一致 Neither you nor he speaks French.
12.both…and 和，既…也 并列主、谓、宾及表语 I can play both football and basketball.
13.nor 也不，引导句子要倒装 He can not speak English, nor can I.
You like apples, so do I.
二、从属连词：
1. after 表示“时间”，在…之后
After I finished the school, I became a worker in the factory.
2.although/though 表示让步， “尽管” Although she is young, she knows a lot.
3.as 表示时间，“当…时”，方式“象…”，原因，“由于、因为”让步，“尽管、虽然”
As it was late, we must go now.
4.as if/as though 表方式，“似乎、好像”
15.no sooner…than 表时间，“刚一…就…”
No sooner had I come home than it began to rain.
16.now that 表原因，“既然，因为，由于”
Now that you are on duty,you should clean the classroom.
17.once 表时间，“一旦…” Once you promise , you should do it.
三、其他
1.since 表时间，“自从…以来” He has been in this company since he left school.
表原因，“既然，由于” Since the job is dangerous, let’s do it more carefully.
2.so far as/as far as 表条件，“就…而言，就…而论”
As far as I know, it is easy for you to speak in English.
3.so that 表目的“以便” Speak loud so that everybody can hear clearly.
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