双重否定变肯定
1. ...never／not／no... without + N
说明︰此句型意为“每…必然…；没有…就没有…”。这是双重否定句。有时译成“没有…而不…”；“每一次…都…”。
No gains without pains.
不劳则无获。
I cannot see this picture without thinking of my father.
看到这幅画使我不能不想起我父亲。
He never visits me without asking about our old friends.
他每次来访必然问起我们昔日的朋友。
He never went to the bookstore without buying some books.
他没有一次到书店而不买一些书。
No one can succeed without working hard.
没有人能够成功而不努力。
No one can live without breathing.
没有一个人可以不呼吸而生存。
2. never ... but ...
说明︰此句型意为“每…必然…”。but连词,相当于if…not…。
It never rains but it pours.
一下雨就倾盆而降－－祸不单行。
She never reads a book but she goes to sleep.
她一看书就想睡觉。
He never goes on a vacation but he takes his pet dog.
他每次度假都会带他的狗去。
I never see him but I am happy. 我看到他就高兴。
3. never fail to + V ...
说明︰此句型意为“必定会…；一定会…”。fail 因包含“失败”的否定意义，故也属双重否定。
She never fails to write to her parents every month.
她每个月一定写信给她的父母亲。
A good teacher never fails to try his best to answer his students.
一个好老师总是尽力为学生解答。
He is eloquent and humorous as well. What he says never fails to please us.
他口才好又幽默，他所说的一定能使我们高兴。
4. cannot but
说明︰此句型意为“不得不…”。but后只能跟动词原形。
I cannot but admire his wise plan. 我不得不赞美他的计划。
They cannot (choose) but admit that our requirement is reasonable.
他们不得不承认我们的要求是合理的。
I could not (help) but laugh. 我不禁笑出来。
5. not uncommon
说明︰此句型意为“…并非不常见”。双重否定，表肯定。
It is not uncommon for parents to put a newborn in a separate room.
父母把新生儿放在分隔的房间并非不常见。
It is not uncommon for women to smoke in public.
妇女在大众面前抽烟并非不常见。
It is not uncommon for people to jaywalk.
人们任意穿越马路并非不常见。
6. not in the least ...
说明︰此句型意为“一点也不…”。
I am not in the least tired.
我一点也不疲倦。
He is not in the least kind.
他心肠一点都不好。
I was not surprised in the least.
我一点也不感到惊讶。
The shop assistant was not in the least afraid of the trouble.
那店员一点也不怕麻烦。
7. cannot ... too ...
说明︰此句型意为“再…也不为过；愈…愈好”。
You cannot be too careful when driving a car.
开车时愈小心愈好。
I cannot thank enough for your kindness.
我再怎么感谢你的好意也不为过。
We cannot emphasize too much the importance of learning English.
我们再怎样强调学英文的重要性也不为过。
It is wrong to think that one cannot make too many friends.
认为一个人交愈多朋友愈好是错的。
He thinks it right that one cannot make too much money.
他认为一个人赚再多的钱也不为过。
You cannot study too hard.
你愈用功愈好。
One cannot be too careful in choosing friends.
择友愈谨慎愈好。
You cannot quit smoking too soon.
你愈早戒烟愈好。
