高中课本原句分析：

There is no doubt that the earth is becoming warmer (see Graph 1) and that it is human activity that has caused  this global warming rather than a random  but natural phenomenon.毫无疑问，地球正变得更加暖和（见图表1），而且全球变暖是人为的，而不是随意的自然现象。

（1）在本句型中，that从句是同位语从句，表示doubt的内容。

（2）在 There is/I have no doubt 后常可跟 that 引导的从句；在肯定句中，doubt 后面有时可跟 whether 引导的从句。There is no/some room for doubt... 没有怀疑余地/有可疑处……

①doubt作为名词，若用在否定句或疑问句中，后面接that引导的同位语从句；若用在肯定句中，后面接whether引导的同位语从句。注意此时不可以用if替换whether。

There is no doubt that you will succeed if you try your best.

毫无疑问如果你尽最大努力你一定会成功。

There is no doubt that he will come on time.他一定会准时来。

There is no doubt that you will succeed if you try your best.

毫无疑问如果你尽最大努力你一定会成功。

There is no doubt that Americans are deep in love with the computer.毫无疑问，美国人已深深爱上了电脑。

I have no doubt that we shall be able to do something for you.毫无疑问，我们能为你做点事。

There is some doubt whether he will be elected. 他是否能当选还不太确定。

There is some doubt whether she will come on time.  她会不会准时来还不一定。

no doubt后还可以接介词of。
We have no doubt that you will succeed.
We have no doubt of your success.我们毫不怀疑你会成功。
There is no doubt that you will succeed.毫无疑问你会成功。

There is no doubt of your success.

There is no doubt that the job of being a president. 毫无疑问，成为主席是一件了不起的事。

We have no doubt of his ability. 我们相信他的能力。

 

②doubt作为动词，若用于否定句和疑问句中，后面接that引导的宾语从句；若用于肯定句中，后面一般接whether或if引导的宾语从句。

I don’t doubt that ...我肯定……(=I’m sure/certain that ...)

I doubt if/whether ...我不确定……

(=I’m not sure/certain if/whether ...)

I doubt whether Jack could manage a sailing boat.  我怀疑杰克会不会驾驶帆船。

She was in doubt whether she was right.  她对她是否正确拿不准。

Do you doubt what I say? 

你怀疑我说的话吗？

I don't doubt that Jane will continue to work here.

简明年会继续在这儿工作这事儿肯定无疑。

I doubt whether he’ll be himself again.  我怀疑他是否能复原。

I doubt if he can go the distance.  我怀疑他能否坚持到底。

I doubt if his deeds would match his stirring words.  我怀疑他的行动是否会与他那激动人心的话是一致的。

I don’t doubt that he is honest. 我毫不怀疑他是诚实的。

We doubt if he is honest.我们怀疑他是否诚实。

doubt of 对...抱怀疑或悲观态度。
The project began badly and we doubt of its further progress.这项工程开始就不顺利,我们怀疑能否继续进行。

I doubt of her ability. 

我怀疑她的能力。

We have never doubted of success. 我们从不怀疑会取得成功。

 

 

常用结构：

in doubt怀疑；拿不定主意

no/without/beyond doubt无疑地，必定

That remains very much in doubt.

这个问题依然非常值得怀疑。

If in doubt, you can call for an ambulance. 

如果不放心，就打电话叫救护车。

We were in doubt where he has gone. 

我们弄不清楚他去哪儿了。

No doubt this will be cleared up soon.

毫无疑问谜底很快会被揭开。

Without a doubt these theories were all wrong. 毫无疑问这些理论是完全错误的。

This is without a doubt a competitive market.

毫无疑问地，这真是一个竞争激烈的市场！

He is without doubt the cleverest student I’ve ever taught.  他确实是我所教过的学生中最聪明的。

 

 

毫无疑问他将马上回来。

1. There ___ ___ _____that he will be back in no time.

2. I ___ ___ _____that he will be back immediately.

3. I ___ ___ ______of his coming back before long.

4. _____ ______ he will be back at once.

 

1. is no doubt

2. have no doubt

3. have no doubt

4. Without doubt

 

 

(1)毫无疑问，他们在这件事上会同意你的。

                          they will agree with you on this matter.

(2)我相信他会成功的。

   I                    he will succeed.

(3)公共图书馆的前途难以预料。

   The future of the public library is          . 

(4)萨莉确实是学校最优秀的游泳者之一。

   Sally was                         one of the finest swimmers in the school.

 

 

 

 

 

 

 

There is no need...没有必要……

There is no question...……是没有问题的

There is no reason...没有理由……

There is no possibility that没有可能……

It is no/small wonder that /No wonder that... 难怪……

It is a wonder that...真奇怪/真是令人惊奇……

句型转换

(1)It is certain that he will come back at once.

There is no doubt that he will be back in no time.

I have no doubt that he will be back immediately.

I have no doubt of his coming back before long.

There is no room for doubt that he will be back soon.

(2)He doesn’t need to stay in Paris any more.

There is no need for him to remain in Paris any more.

即学即用

 

doubt n. 怀疑；疑惑，疑问，不确定，不相信
　　v. 对……无把握，不能肯定，认为……未必可能；
　　怀疑，不相信，不信任

　　【doubt的用法精析】
　　(1) doubt无论作名词还是动词，如果用在否定句或疑问句中，其后的宾语从句或同位语从句常用that引导；如果用在肯定句中，其后的从句多用if或whether引导（若是同位语从句，则只能用whether引导，不能用if）。

　　I doubted that the President could come to Moscow if we suffered a defeat.
　　如果我们吃了败仗，我怀疑总统还能否到莫斯科来。

I doubt if/whether the divorced couple will come together again.
　　我不敢肯定这对已离婚的夫妇是否能重归于好。

 

 

He expressed doubt whether Britain really wanted full membership.
　　他怀疑英国是否真正在希望取得完全的会员国资格。

 

 

 

　　(2) in doubt 不确定，怀疑，拿不准

　　(3) beyond/without doubt 无疑地，确信地

　　(4)doubt of
　　对...抱怀疑或悲观态度。
　　The project began badly and we doubt of its further progress.
　　这项工程开始就不顺利,我们怀疑能否继续进行。

 (5)，no doubt后接that从句或介词of。
We have no doubt that you will succeed.
We have no doubt of your success.我们毫不怀疑你会成功。
There is no doubt that you will succeed.毫无疑问你会成功。

There is no doubt of your success.

 

 

I don’t doubt that ...我肯定……(=I’m sure/certain that ...)

I doubt if/whether ...我不确定……

(=I’m not sure/certain if/whether ...)

常见练习

(1)单项填空

There is no doubt ______ he will be asked to speak again next year.

A. that   B. whether   C. what   D. how

(2)翻译句子                                                                   (原创)

①我们毫不怀疑他能够做好这件事。

②毫无疑问我们会成功的。

解析：(1) 选A。 动词doubt 后的同位语从句的引导词有这样的规律：如果doubt前有否定词，从句用that引导;如果doubt前没有否定词，则用疑问代词、副词或whether引导。

(2)①We don’t doubt that he can do it well.

②There is no doubt that we will be successful.