C3 Unit 1 条件状语从句+现在完成时

条件状语从句、连词和现在完成时

一、条件状语从句

主将从现（主句为一般将来时或祈使句时，从句用一般现在时）

1.I’ll visit the great wall if it doesn’t rain tomorrow.

2.If I don’t get enough sleep, I will not be able to concentrate at school.

e your head, and you’ll find a way.

=if you use your head, you’ll find a way.

4.Give me a call once you arrive at the airport.

5.Once I finish my work I will call you.

6.I won’t remember new vocabular ies unless I write them down.

条件状语从句的连词有：

If, once, unless

二、连词

1）、并列连词：

And, both…and, as well as, not only…but also, neither…nor

She can speak both English and French.

My father bought me a present, and I like it very much.

He can speak not only English but also French.

2）、转折连词：

But, yet, while

The doctor tried to save the patient, ___they failed.

Lucy likes red while Lily likes white.

3）、表示选择关系的连词

Either…or, neither…nor, or

Study hard, or you’ll fail the exam.（否则）

You can visit the museum now or we can do it later.

You can neither know nor understand everything in a few hours.（既不…也不）You either stay at home or go shopping with me.（要么…要么）

4）、表示因果关系的连词和并列句：

For, because, so, therefore

I have to stay up late, for I have lots of homework to do. (因为)

She worked until midnight yesterday, she is very tired today.

三、现在完成时

构成: have/has +过去分词done

标志词：

注意：since, for+一段时间时，have/has必须加持续性动词。

Buy---have, borrow---keep, leave----be away from, join----be in, die----be dead，begin----be on

大部分的瞬间动词都可以转化为be+形容词。

我离开这所学校八年了

他借用我的词典已经两天了。

一、中译英

1.如果明天下雨，我们就不去野餐。

rains tomorrow, we go on picnic.

2.我每天都会去散步，除非遇上坏天气。

weather stops me, I every day.

二、Complete the sentences with if, once or unless.

3.you have confidence in yourself, you’ll learn English better.

4.Please call me you arrive home.

5.we study harder, we won’t do well on the exam.

6.You’ll remember words better you are in a good mood.

7.I finish reading this novel, I’ll lend it to you.

8.We won’t catch the first bus we get up earlier.

(2014北京一模的连词和时态题)

25. Lisa was late for school today______ she didn’t catch the early bus.

A. and

B. but

C. or

D. because

31. Lucy _______ her cat and now she is washing it.

A. finds

B. is finding

C. has found

D. will find

30. I ______ you a copy of the report as soon as I finish it.

A. send

B. sent

C. will send

D. has sent

31. My uncle is a writer. He ______ many books since he was young.

A. writes

B. wrote

C. is writing

D. has written

33. The park gates ______ at 10:00 every evening.

A. lock

B. locked

C. are locked

D. were locked

24. Our classroom is not big，_______ it’s very clean.

A. and

B. but

C. or

D. so

32. Mr. Brown _____ in this factory since he was twenty-four years old.

A. works

B. worked

C. will work

D. has worked

33.A book fair _____ in Chaoyang Park last month.

A. hold

B. held

C. is held

D. was held

32. Gina a lot_____ since she joined the art club.

A. learns

B. learned

C. will learn

D. has learned

32.—I didn't know you were friends with Mr. Smith.

—We ____ each other for 6 years.

A. knew

B. are known

C. have known

D. will know

24. I was feeling hungry, ____ I bought myself a sandwich.

A. but

B. so

C. or

D. because

25. I want to buy some postcards in the shop, ______ I don’t have enough money.

A. but

B. and

C. or

D. so

29. Mr. Green, a famous writer, ______ our school last month.

A. visited

B. visits

C. is visiting

D. will visit

31. Tony knows China very well because he ______ in China for twenty years.