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never fail to ,双重否定意味肯定，运用双重否定结构加深句子的语义

If you ask for help in the polite way,you never fail to succeed.

If you receive requests like this,you'll never fail to accept.

双重否定结构

1. never fail to,can't fail to,don't fail to,否定词 fail to

2. 否定的形容词之前加以否定，unreasonable,not unreasonable

What he said is not unreasonable.

It is quite common(not unvommon) for us to make mistakes.

3.not without

You can't obtain English without working hard.

He doesn't have any meal without meats.

4.no not

There is no cat that doesn't like fish.

There is nothing that he can't do.

There is no rule that has no exception.

as well

as a result

have learned to :学会了，习惯了

People have learned to expect that trains are punctual.

Children have learned to expect that their parents are very able.

be suspicious of sb:对什么表示怀疑，存有戒心

one of the things that fascinates us most,that引导定语从句

that 引导同位语从句

One of the things that fascinates us most about planes is the popular fact that they are safe and

fast.

turth,不可数名词，a good deal of

apparently:显然，显而意见

It seems that...

survive(v.),fall(v&n.)

a cat's ability to survive falls is based on fact

be based on: 基于事实基础之上

base sth on：把某事加强在什么基础之上

We base the theory on the fact.

The theory is based on fact.

make a study of sth:对什么作出研究

over a period of five months.

in common=the same.

fall off ：坠落，掉落