高中英语语法重点难点回顾
Covered with confusion, I left the room.我很窘地离开了房间。
United, we stand; divided, we fall. 团结则存，分裂则亡。
He used to live in London, use(d)n’t he /didn’t he?
There used to be a cinema here before the war, use(d)n’t there /didn’t
there?
Such things ought not to be allowed, ought they?
He ought to be punished, oughtn’t he?
但在正式文体中,用ought we not形式。例如:
We ought to go, ought we not?或We ought to go ,should we not?
含有情态动词must的句子表示推则,作“想必”解时,疑问部分不可用mustn’t。若前句强调对现在情况的推测,疑问部分用aren’t(isn’t)十主语,例如：You
must be tired,aren’t you?若陈述部分的must表示“有必要”时,附加疑问句部分则用needn’t。例如：You must
go home right now, needn’t you?
当mustn’t 表示禁止时,附加疑问部分一般用must。如：
You mustn’t walk on grass, must you?
前句谓语动词是must
have＋过去分词时,若前句强调对过去情况的推测(一般有过去时间状语),疑问部分的谓语动词用didn’t＋主语;若前句强调动作的完成,疑问部分的谓语动词用haven’t(hasn’t)＋主语,
例如：
He must have met her yesterday, didn’t he?
You must have seen the film, haven’t you?
陈述句谓语部分出现否定词缀时(前缀或后缀),疑问部分仍用否定结构。例如:He is unfit for his office, isn’t he?
如果陈述部分包含有no, never, hardly, seldom, few, little,nowhere,
nothing等否定或半否定词时,疑问部分用肯定形式。例如：He is hardly 14 years old,is he?
如果陈述部分的主语为everyone,someone,no one等不定代词,其疑问部分的主语可用he,也可用they。
Everyone knows his job, doesn’t he?
Everyone knows their job,don’t they?
No one was hurt,were they?
I’m late, aren’t I?
One can’t be too careful,can one(you)?
Have a cup of tea, will you?
Let’s go there,shall we? Let us go there,will you?
同位语从句跟在名词后面,进一步说明该名词的具体内容。引导同位语从句的名词主要有fact, news, promise, idea,
truth等。连接词用that (不用which)及连接副词how, when, where, why等。例如：
His delay is due to the fact that the car went wrong halfway.
The news that our team has won the match is true.
She asked the reason why there was a delay.
关联词只能用whether不能用if表示“是否”的情况如下:
A)在表语从句和同位语从句中。例如：
The question is whether the film is worth seeing.
The news whether our team has won the match is unknown.
B)在主语从句中,只有用it作形式主语时,whether和if都能引导主语从句,否则,也只能用whether。例如：
Whether we shall attend the meeting hasn’t been decided yet.
It hasn’t been decided whether(if)we shall attend the meeting.
C)在介词之后。(介词往往可以省略)例如：
It all depends (on) whether they will support us.
D)后面直接跟动词不定式时。
He doesn’t know whether to stay or not.
E)后面紧接or not 时。
We didn’t know whether or not she was ready.
F)引导让步状语从句,只能用whether。
Whether you like it or not, you must do it well.
G)用if会引起歧义时。例如：Please let me know if you like it.
该句有两个意思：“请告诉我你是否喜欢”。
或“如果你喜欢,请告诉我。”用了whether就可以避免。
在下面几种情况下必须用“that”引导定语从句：
1)先行词是不定代词：all,few,little, much,something,nothing,anything等。All that we
have to do is to practise every day.
2)先行词被序数词或形容词最高级所修饰。
The first lesson that I learned will never be forgotten.
3)先行词被all,any,every, each, few,little,no,some, 等修饰。
I have read all the book (that) you gave me.
4)先行词被 the only, the very, the same, the last 修饰时。
He is the only person that I want to talk to.
5)先行词既有人又有物时。They talked of things and persons that they remembered in the
school.
先行词是表示地点时,要根据从句的谓语动词是及物的还是不及物的。如果是及物的就用that(which),否则用where。
This is the house where he lived last year.
This is the house that (which) he visited last year.
用no
sooner…than和hardly…when引导的从句表示“刚……就……”。主句中的动词一般用过去完成时,从句用过去时;而且主句一般倒装,把助动词had提到前面。例如：Hardly
had I entered the room when I heard a loud noise.
代词作主语时,主谓语序不变。Here it is. Here he comes.
当句首状语为表示地点的介词词组时也常常引起全部倒装。
South of the city lies a big steel factory.
From the val
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