选了10种语法、句式,不知是否有帮助.
1.1 stop doing/to do
stop to do 停止,中断做某事后去做另一件事.
stop doing 停止做某事.
They stop to smoke a cigarette. 他们停下来,抽了根烟.
I must stop smoking. 我必须戒烟了.
2.forget doing/to do
forget to do 忘记要去做某事. (未做)
forget doing 忘记做过某事. (已做)
The light in the office is stil on. He forgot to turn it off.
办公室的灯还在亮着,它忘记关了.(没有做关灯的动作)
He forgot turning the light off.
他忘记他已经关了灯了. ( 已做过关灯的动作)
Don't forget to come tomorrow.
别忘了明天来. (to come动作未做)
3.go on doing/to do
go on to do 做了一件事后,接着做另一件事.
go on doing 继续做原来做的事.
After he had finished his maths,he went on to do his physics.
做完数学后,他接着去做物理.
Go on doing the other exercise after you have finished this one.
作完这个练习后,接着做其他的练习
4.感官动词 + doing/to do
感官动词 see, watch, observe, notice, look at, hear, listen to, smell, taste, feel + do 表示动作的完整性,真实性；+doing 表示动作的连续性,进行性
I saw him work in the garden yesterday.
昨天我看见他在花园里干活了.(强调"我看见了"这个事实)
I saw him working in the garden yesterday.（强调"我见他正干活"这个动作）
昨天我见他正在花园里干活.
典型例题
1）They knew her very well. They had seen her ___ up from childhood.
A. grow B. grew C. was growing D. to grow
答案：A.因题意为,他们看着她长大,因此强调的是成长的过程,而非正在长的动作,因此用see sb do sth 的句型.
2）The missing boy was last seen ___ near the river.
A. playing B. to be playing C. play D. to play
答案A. 本题强调其动作,正在河边玩,应此用see sb. doing sth句型.
5.used to / be used to
used to + do："过去常常"表示过去习惯性的动作或状态,但如今已不存在.
Mother used not to be so forgetful.
Scarf used to take a walk. (过去常常散步)
be used to + doing： 对……已感到习惯,或"习惯于",to是介词,后需加名词或动名词.
He is used to a vegetarian diet.
Scarf is used to taking a walk.(现在习惯于散步)
典型例题
---- Your phone number again? I ___ quite catch it.
---- It's 69568442.
A. didn't B. couldn't C. don't D. can't
答案A. 本句虽没有明确的时间状语,但从语意上看 出,在听的时候没有听懂这个动作发生在过去,因此应用过去时.
6.need/want/require/worth
注意：当 need, want, require, worth(形容词)后面接doing也可以表示被动.
Your hair wants cutting. 你的头发该理了.
The floor requires washing. 地板需要冲洗.
The book is worth reading. 这本书值得一读.
典型例题
The library needs___, but it'll have to wait until Sunday.
A. cleaning B. be cleaned C. clean D. being cleaned
答案A. need (实意) +n /to do,need (情态)+ do,当为被动语态时,还可need + doing. 本题考最后一种用法,选A.如有to be clean 则也为正确答案.
典：done,"不可能已经".must not do 不可以（用于一般现在时).
7.so, neither, nor作部分倒装
表示"也"、"也不" 的句子要部分倒装.
Tom can speak French. So can Jack.
If you won't go, neither will I.
典型例题
---Do you know Jim quarrelled with his brother?
---I don't know, _____.
A. nor don't I care B. nor do I care C. I don't care neither D. I don't care also
答案：B. nor为增补意思"也不关心",因此句子应倒装.A错在用 don't 再次否定, C neither 用法不对且缺乏连词. D缺乏连词.
注意： 当so引出的句子用以对上文内容加以证实或肯定时,不可用倒装结构.意为"的确如此".
Tom asked me to go to play football and so I did.
---It's raining hard. ---So it is.
8.as, though 引导的倒装句
as / though引导的让步从句必须将表语或状语提前 （形容词, 副词, 分词, 实义动词提前）.
注意：
1) 句首名词不能带任何冠词.
2) 句首是实义动词, 其他助动词放在主语后.如果实义动词有宾语和状语, 随实义动词一起放在主语之前.
Try hard as he will, he never seems able to do the work satisfactorily.
注意:
让步状语从句中,有though,although时,后面的主句不能有but,但是 though 和yet可连用.
9.比较if only与only if
only if表示"只有"；if only则表示"如果……就好了".If only也可用于陈述语气.
I wake up only if the alarm clock rings. 只有闹钟响了,我才会醒.
If only the alarm clock had rung. 当时闹钟响了,就好了.
If only he comes early. 但愿他早点回来.
10.begin(start) doing/to do
begin / start to do sth
begin / start doing sth.
1) 谈及一项长期活动或开始一种习惯时,使用doing.
How old were you when you first started playing the piano?
你几岁时开始弹钢琴?
2) begin, start用进行时时,后面动词用不定式to do
I was beginning to get angry.
我开始生起气来.
3) 在attempt, intend, begin, start 后接know, understand, realize这类动词时,常用不定式to do.
I begin to understand the truth.
我开始明白真相.
4) 物作主语时
It began to melt.
http://www.iselong.com/online/Grammar-Dictionary/index.htm
