②否定句中doubt多接that同位语从句。如:

There is no doubt that they will ask you for help. 毫无疑问,他们会请你帮忙的。

I have no doubt that you will succeed. 我毫不怀疑你会成功的。

二、作及物动词常用于下列句型中,作"怀疑;不能肯定;不大相信"解,一般不用进行时态。

①用于否定句或疑问句,后接that引导的宾语从句。如:

I don't doubt that he is telling the truth. 我毫不怀疑他在讲真话。

Do you doubt that he will win the match? 你怀疑他会赢这场比赛吗?

②用于肯定句,一般接whether 或if引导的宾语从句.如:

I doubt whether we will make a profit out of it. 我认为我们不可能从此事中获利。

We doubt if she will be persuaded. 我们不知道她会不会被说服。

4. He found that the amount of carbon dioxide keep on increasing during that time.

①amount n. 数量

习惯用语：

an amount of 相当数量的; 一些 修饰不可数名词

amounts of 相当数量的; 一些 修饰不可数名词

large amounts of money 大量的金钱

②keep on 继续 +doing sth.

They keep on working although they are tired. 他们虽然很累了，还是继续工作。

5. result in

result in 结果; 致使; 导致

主语：起因 in 的宾语：结果

Acting before thinking always results in failure.做事不先考虑总会导致失败。

The accident resulted in the death of two people.这场意外事故造成两人死亡。

result from 起于, 由于, 由...引起，

主语： 结果 from 的宾语：起因

His sickness resulted __in____ eating too much. (in / from)

6．concern

① v.使担心；使关心；使烦恼

The boy's poor performance at school concerned his parents.

这个男孩在学校很差的表现，使他父母很担心。

注意：其过去分词concerned通常作形容词用，意为"担心的；烦恼的；忧虑的"。

The concerned parents were all concerned for the children's safety.

忧心忡忡的家长们都为孩子们的安全担忧。

②涉及；与......有关或相关

Attend to what concerns you. 注意与你有关的事物。

注意：其过去分词concerned常用来作表语，意为"和......有关；牵涉"；而作定语，则意为"有关的"。

It is reported that the pop singer is concerned with selling drug. 据报道，那个流行歌手涉嫌贩毒。

He asked all concerned to take an active part in helping the girl.

他要求所有相关的人积极帮助那个女孩。

二、concern作名词

1. 有关......的事（可数）

That's my concern, so I'll do as I like about it. 那是我的事，因此，我想怎么做就怎么做。