have difficulty/trouble/hard time/business (in) doing sth. 18
当 连 接 代词what/whose、 连 接 副词how/when以及 whether引导的从句或不定式短语时，其前面的of、 about、as to等常可省略。
I don't care (about) what she is. He has no idea (about/as to) how to solve the problem. The man wasn't aware (of) how he got lost.
He says she is a good mother but I think not.
Such a bad man should do this good indeed, absolutely not.
15
do so、do that和do it代替“动词+宾语”或“动词+状语”。
He said he would read English books, but he didn’t do so (=read English books). His mother told him to get up early, but he didn’t do so (=get up early). He wants to make a visit and I also want to do it. She tries to find a good job and finally she does that.
He is fatter than (he is) ever.
When (they are) ripe, apples turn red and yellow.
23
状语从句谓语动词是纯do的形式（即do、does、did、have done、 has done、had done这几种形式，do不可和其它助动词或情态动 词连用）时，可以将状语从句的主语省略，将相应的谓语变为非
10
关系代词的省略
He is the man (that/who/whom) I met yesterday. The pen (that) I picked up on the road and that I put in my pencil box had gone.
11
关系副词的省略
用在某些表示时间名词后的关系副词可省略，如：the time、every time、each time、the moment等。 By the time (when) he was six, he had set his life-long aim. I still remember the first day (when) I went to school. Every time I see the picture, I will recall my childhood. 当先行词为way时，关系副词常常省略。
I appreciate the way (that/in which) you teach us. He plays basketball the way his father does.
12
do用来代替动词或动词加其它成分 。
Tom runs faster than John does (=runs). Did you water the flowers today? Yes, I did (=watered the flowers). He didn’t pass the driving test, but I wish he had done (=passed the driving test).
4
“主语+谓语”的省略
Although (he is) a boy six year old, he knows a lot. If (you are) interested in a subject, you will learn it well.
5
“主语+动词+宾语”的省略
—For whom you bought the birthday present? —For my mother (I bought the birthday present).
19
表示一段时间或方式短语中的for、in、by等常常省略，但 当介词短语放在句首或是在否定句中时for一般不可省略。
The meeting lasts (for) about two hours. We can't ill-treat children (in) this way. You can solve the puzzle (by) using this method. I haven't seen you for a long time. For many years they have been married.
14
so可以代替单词、词组或句子，作call, expect, think,
believe, suppose, guess, hope, do, fear, imagine, hear, say, tell, be afraid, notice等宾语，not用以代替否定的 句子，用法与so相似，并可放在perhaps、probably、 absolutely等副词后面。
promoted to a higher rank in the company.
While (you are) on the top of the mountain, you can have a
wonderful view of the whole city.
Although (he was) beaten by his father, he didn't cry.
13
to在省略结构中代替不定式，常同want, try, expect, hope, like, refuse, forget, remember, wish, mean, intend等连用。
Maybe I have hurt him, but I don't mean to (hurt him). I asked him to lock the door, but he forgot to (lock the door). He is a doctor but he doesn't want to be (a doctor). —Has he already found a job? —Yes, he is likely to have (already found a job).
Because of being ill, he didn't go to school.
Before he was admitted, he entered.
Before being admitted, he entered.
After he was caught by the police, the thief admitted.
谓语，即doing或having done两种形式（因为状语从句的主语在 谓语中没有be动词的情况下，只可能是主动关系，不可能是被动 关系），而且引导状语从句的连词一般都可省。
16
one和ones代替可数名词
This coat is a little big. Can you give me a bigger one? Please give me another (this, that) one.
17
动名词前in/at的省略
It is no use/good (in) doing sth. There is no use/point/hurry/good (in) doing sth. be busy (in) doing sth. employ/engage/occupy/busy oneself (in) doing sth. take turns (in, at) doing sth. spend/lose/waste time/money/energy (in) doing sth. be employed/engaged/occupied (in) doing sth.
21
状语从句中的省略
将状语从句的主语连同be动词一起省略。但是由after、 before、because等引导的状语从句一般要改成介词短语的形 式，用动名词being代替省去的be（因为after、before本身 就可作为介词，而because的介词短语为because of）。
22
Because he was ill, he didn't go to school.
He is my best friend and I do hope he can remain so (my best friend).
The hero sacrificed his own life to save a girl and so I've heard. (The
hero sacrificed his own life to save a girl.)
6
名词短语中中心词的省略
A bird in hand is worth two (birds) in bush. He is the first (student) to come into class and the last (student) to leave.
7
所有格后名词的省略
He stayed at his grandpa's (house) for a week. She bought the coat at Mary's (shop).