9、动词动词表示主语的动作或状况
动词的类型。
及物动词vt，其后接宾语。
eg.She wears a uniform.
不及物动词vi，不接宾语。
eg :She can dance.
连系动词like-v.接表语。
eg.They are nurses.
That sounds interesting.
His mother looks young.
If you keep milk for too long, it goes bad.
助动词aux--V.接动词原形或分词。
eg,DO you like pandas?
He has gone to Australia.
She is looking at the cat.
情态动词mod-v.接动词原形。
Eg. He must go now.
You should clean the classroom after class.
有的动词既可作及物动词，也可作助动词或不及物动词，be也可作助动词。
eg.I do my homework after class.
Do as1 you like.
She is a little bit2 quiet.
She is swimming now.
二)情态动词的使用方法
can，could3，may的使用方法
l .can／could
表示具备某种能力，意为能，可以，会。
eg.I can sing English songs.
Lisa cant speak Japanese4.
She could swim when she was5 four years old.
表示许：可、允许，意为可以。
eg.Can we watch TV now?
You cant play computer games in the morning.
表示请求某人做某事，意为能，可以。
eg.Can／Could you help me，please?
表示推断可能，多用于否定句和疑问句中。
cg。it cant be true6.这不可能是真的。
Where can he have gone?他或许会到哪里呢?
2.may／might
表示许可、允许，意为可以，比can更正式。
eg. May l use your pen?我可以用你的钢笔吗?
May l ask you a question?我可以问你个问题吗?
表示推断可能，用于一定句和否定句，不可以用于疑问句。
eg.Hemay be at home now.他可能目前在家。
She may not be there today.今天她可能不在那儿。
can与be able7 to有什么区别
1.两者都可以用来表示能力。
eg.I can／am able to mend8 the bike.
2.can只有目前时和过去时，而be able to可用于多种时态。
eg. I will be able to come back in another few9 months.
He hasnt been able to get there before dark10.
3.can可以表示推断，但be able to不可以。
eg.That Can't be Gina's dictionary11.
4.can与be able to；不可以重复用
eg.他能做好这件事。
He can be able to do is well.
He can do it well.
He is able to do it well.
must与have to有什么区别
1.主客观方面不同。
must表义务或强制，表示主观的必要；在一定句中must还可表推断，语气要比may一定多。have to表需要或不能不，表示客观的必要。
eg.We must clean the room.
We have to clean the room.
He must beat12 home before supper。
2.人称和时态不同。
must无人称和时态的变化，一律用must十动词原形。have to后接动词原形，有人称、数和时态的变化，一般目前时的第三人称单数要用has to，过去时中要用had to，以后时中要用will have to。另外，have to还可与，情态动词和助动词连用。
eg: Tom must practice13 his guitar every day.
The train has left.We'll have to wait for the next train.
3.否定式及意义不同。
must not=mustn't决不可／千万不可／务必不要； dont／doesnt／didnt／wont+have to不必
eg.We mustnt tell jokes14 on him.大家千万不可与他开玩笑。
We dont have to tell jokes on him.大家不必和他开玩笑。
在对May I?作否定回答时用No， youmustnt／cant.
eg. Mayl go to the movies? NO，You mustn't
5.疑问式及回答不同。
Must+主语+动词原形+? Yes，主语+ must.／NO，主语+neednt.
助动词+主语+have to+动词原形+?
Yes，主语+助动词.／No，主语+助动词+not.
eg.Must l go now? Yes，you must.／NO，you neednt
Does she have to go to the doctor? Yes，she does.／NO，she doesnt.