第九部分 情态动词
I． 要点
助动词本身无意义，在句中帮助主要动词构成一定的时态，语态、语气，或是帮助构成否定句和疑问句，常用的助动词有be, do, have, shall(should), will(would).
情态动词表一定的词义，本身并不表示动作或状态，而仅仅表达说话人的态度，它在句中须和主要动词一起构成谓语，主要的情态动词有can(could), may (might), must, have to, ought to, need, dare, shall, should, will, would.
1、can 能，可以，表说话人同意，许可还可表客观条件许可，如:You can go now.
提建议或请求时可用can I, can you表客气，如Can I buy you a drink?
can和be able to表能力时的区别。
can表一般具有的能力，be able to表在特定条件下的能力，如:Although the driver was badly hurt, he was able to explain what had happened.
2、may
（1）、可以，表说话人同意，许可或请求对方许可。You may go.
（2）、（现在和将来）可能，也许，只用于肯定句和否定句中，如He may not be right.
3、must, have to
must表主观上的必须，have to表客观上的必须，如:It's getting late. I have to go. -Must I go now. -Yes, you must.
(No, you needn't./ No, you don't have to.)
4、need, dare这二词有实意动词和情态动词两种词性，如用作实意动词后接动词不定式to do，如用作情态动词后接动词原形。Need I go now? --Yes, you must./No, you needn't.)
5、shall用于第一人称疑问句中表说话人征求对方的意见或向对方请求，如，Shall we begin our lesson?
用于二、三人称陈述句，表说话人命令、警告、允诺、威胁等口吻，如: You shall fail if you don't work harder.
6、should表应该，意为有责任，有义务。如:We should try our best to make our country more beautiful.
7、will表有做某事的意志、意愿、安心、打算，如 "Will you lend me your book?" "Yes, I will."，
8、should have done表应该做而未做
must have done表对过去事实的肯定推测
could have done表本可以做某事
9、判断句：肯定句用must, 否定句用can't, 不太肯定用may, might
He must be in the office now.
He must have gone to bed, for the light is out.
He can't be in the office. He is at home.
He couldn't have cleaned the classroom, because he didn't come here today.
He might be in the office, I am not sure.
He might have cleaned the room, I suppose.
例题
例1，They _______ to walk in the street at might.
A. didn't dare B. not dared C. not dare D. dared not
解析，该题答案为A， 此空需选一动词作谓语，因为后面是to walk, didn't dare是行为动词dare过去时态的否定形式。
例2，When he was very old, Mr. Smith _______ sit for hours without saying a word.
A. would B. should C. must D. used
解析，该题答案为A, would此处表过去的倾向性，习惯性动作，意为"总是"如: When we were children, we would go swimming every summer.
第十部分主谓一致
I． 要点
谓语受主语支配，须和主语在人称和数上保持一致，这叫做主谓一致，主谓一致包括语法一致、意义上一致和就近一致。
1、语法上一致
（1）、以单数名词或代词，动词不定式短语、动名词短语或从句作主语时，谓语动词要用单数，主语为复数时，谓语用复数，如，
To work hard is necessary for a student.
（2）、用and或both……and连接的并列主语，谓语动词用复数，如，
Both he and I are right.
但并列主语如果指的是同一人，同一事物或同一概念，谓语动词用单数，如, His teacher and friend is a beautiful girl.
（3）、主语是单数时，尽管后面跟有as well as, but ,except, besides, with ,along with, together with, like等，谓语动词仍用单数，如，
The teacher as well as his students is excited.
（4）、某些不定代词，如做主语，谓语动词要用单数，如:Everyone has a book.
（5）、一些只有复数形式的名词，如people, cattle, clothes等作主语时，谓语动词要用复数，如，A lot of people are dancing outside.
2、意义上一致
（1）、表时间、距离、价格、度量衡等的名词作主语时，谓语动词通常用单数，如，
Twenty years is not a long time.
（2）、表示总称意义的名词public, police, cattle, clothes等作主语时，谓语动词用复数，如，
People are talking about the accident.
（3）、有些集合名词，如family, team等作主语，如作为一个整体看待，谓语动词用单数，如指其中每个成员，则用复数，如，
My family is a big one.
My family are watching TV.
3、邻近一致
用连词or, either……or, neither……nor, whether……or, not only…but also,等连接的并列主语，如果一个是单数，一个是复数，则谓语动词按就近一致原则，与最靠近它的主语一致，如，
Either you or I am mad.
例题
例1、 The chemical works _______ where my father has worked for thirty years in 1949.
A. was built B. were built C. is built D. are built
解析：该题答案为A。works形式上是复数，意思上是单数，因此谓语动词用单数，类似的还有news, maths, politics, physics.
例2、They each _______ a copy of the new physics.
A. have B. has C. having D. gets
解析：该题答案为A。They each不等于each of …, each of 这个词组作主语谓语用单数如each of the students hands in their homework，而they each作主语，谓语要随each前面的词来变化。
第十一it 与there be的用法
I．要点
1、it的用法
（1）用作人称代词，代替前文提到的无生命的事物，动植物、婴儿及指示代词this, that，如，
I have a new pen. It is beautiful.
The Browns have a new baby. It's cute.
（2）用来表示时间、天气、距离等，如，
It's twelve o'clock now.
It's fine today.
（3）用作引导词(形式主语或形式宾语)，代替由不定式，ing形式或从句表示的真正的主语或宾语，如，
It's no good telling him that.
It's necessary for you to do so.
（4）用在强调结构中，构成强调句式：It is/was +被强调部分+that/who/whom +句子其余部分，可强调除谓语以外的句子其他成分，如，
It was this morning that I saw him in the street.
It was I who saw him in the street this morning.
It was in the street that I saw him this morning.
It was him whom I saw in the street this morning.
2、there be句型
英语表示某时某处或某物时，常用there be句型，这是一种倒装结构，如，
There are a lot of students playing on the ground.
There is going to be a test this afternoon.
当主语有两个或两个以上时，动词be常和最近的那个主语取得一致，如，
There is a pen and three pencils in the pencil-box.
There isn't a desk, a bench and three chairs in the room.
There are lots of people like it, aren't there?
there be句型，谓语动词除be之外，还可用其他表示存在，位置移动等意义的不及物动词或词组，如exist, stand, lie, enter, come, happen to be, appear to be等，如，
There stands a house at the foot of the hill.
there be句型表示"存在"而have表"有"、"拥有"，所以there be中 be不能换成have，但当have表示事物的特征时，可用"主语+have"结构替换there be 句型，如：
There are five doors in the house.
The house has five doors.
there be 的其它句型：
1、There must be a meeting in the office.
2、There have been great changes since 1979.
3、There being no bus, we had to walk home.
例题
例１ ____ that he went to sleep.
A It was until midnight B That was until midnight
C It was not until midnight D That was not until midnight
解析：该题答案为C。强调until结构时，要将否定词not移到until前。又如：He didn't leave until twelve 改为It was not until twelve that he left.
例２ There are a lot of students ____ in the class room.
A talk B talking C talked D to talk
解析：该题正确答案为B。 There be句型为倒装句，可换为A lot of students are talking in the class room. 又如：There is a lot of noise heard out in the street.