情態(tài)動詞記憶口訣:
情態(tài)動詞兩要點;動詞原形跟后面,說話語氣較委婉,can表'能力'may'許可',must'責任'或'義務',否定回答'needn't'換;should'應該',would'愿',have to '被迫'表客觀.
注釋:對must構(gòu)成的一般疑問句作否定回答只能用needn't.
can的用法
1. 表能力
Can your sister skate / Can you sing / Can you dance
2. 表示可能性
Can you go with us
We can go there by bus.
3. 表示同意做某事,意為'允許','可以'
You can go now.
Can I have a look at your photos
4. 表
推測(主要用于否定句,疑問句)
It can't be Jay Zhou.
He can't be thinking about something.
must的用法
1. 表示按命令,規(guī)定,責任等必須要做的事.
You must do all the homework by yourself.
You mustn't park your car here.
在回答由must引導的一般疑問句時,如果表示肯定,用must;如果表示否定,要用needn't.
-Must I come here tomorrow
-Yes, you must.
(No, you needn't.)
2. 表示肯定的推測,意為'一定會','一定是',多用于肯定句.
It must belong to Karla.
He must be happy.
You must be joking.
must和have to 的區(qū)別是:must表示說話人的主觀意愿,而have to 則表示客觀要求,意為'不得不'.
You must tell us what you have seen.
He had to walk home because the bus had left.
need的用法
need除了可用作行為動詞外,還可用作情態(tài)動詞,作為情態(tài)動詞使用時,多用于疑問句和否定句,后面直接跟動詞原形,作為行為動詞時,后面跟帶to的動詞不定式.
他需要現(xiàn)在去看醫(yī)生嗎
Does he need to see a doctor now
Need he see a doctor now
need作為情態(tài)動詞,意為'需要',無時態(tài)和人稱的變化.
They needn't hand in their homework now.
Need I stay with you
(肯定回答為:Yes, you must. 否定回答用No, you needn't.)
may的用法
1. 表示'可以',用以詢問或說明可否做某事.
May I use your pencil
You may come here tomorrow.
(在回答由may引導的問題時,常以Yes, please或certainly來表示允許或同意,而用please don't 或no, you mustn't來表示不允許和反對.)
2. 用于表推測某事可能發(fā)生或某情況可能存在,意為'可能',一般不用于疑問句.
It may rain this afternoon.
She may still be in the classroom.
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