A. 定義:情態(tài)動(dòng)詞是一類用于表示說話人的'語(yǔ)氣和情態(tài)的助動(dòng)詞.常表示命令、請(qǐng)求、拒絕、義務(wù)、可能、需要等.can和may是其中兩個(gè).
B. 情態(tài)動(dòng)詞的幾個(gè)特征:
、偾閼B(tài)動(dòng)詞不同于實(shí)義動(dòng)詞,不可單獨(dú)作謂語(yǔ),只有跟實(shí)義動(dòng)詞連用才有意義;
、谇閼B(tài)動(dòng)詞沒有人稱和數(shù)的變化;
、矍閼B(tài)動(dòng)詞后的動(dòng)詞必須用原形.
C. can的用法:
①表示有能力做某事,意為“能、會(huì)”.如:
The girl can sing in English.
、诒硎驹S可,意為“可以”,如:
You can drive my car to the post office.
、郾硎就茰y(cè),意為“也許,可能”.如:
He can’t be your brother,you don’t look the same.
D.may的用法:
、俦硎菊(qǐng)求,語(yǔ)氣比can弱.如:
–May I use your eraser?
– Certainly.But you must give it back to me soon.
②表示推測(cè),意為“也許,可能”.如:
She may be at home.Let’s go to see him.
E.情態(tài)動(dòng)詞的否定式和疑問式:
、俜穸ㄊ剑阂话阍赾an,may后面加not.如:
You can’t use the bike.
He may not be right.
、谝蓡柺剑簩an,may提前即可.如:
I’m very tired.May I have a rest?
Can you help me (to) study maths?