3. 有時(shí)態(tài)的變化
He could not read and write at the age of three.
She can speak five kinds of foreign languages.
It will be fine next week.
4. 有語(yǔ)態(tài)的變化(被動(dòng)語(yǔ)態(tài))
The tree may be planted in spring.
Teenagers should be allowed to choose their own clothes.
The room must be kept clean.
注：need 與dare，既是情態(tài)動(dòng)詞又是行為動(dòng)詞，其區(qū)別如下：
情態(tài)動(dòng)詞 行為動(dòng)詞
無(wú)人稱(chēng)和數(shù)的變化,無(wú)過(guò)去式 有人稱(chēng)和數(shù)的變化
后接動(dòng)詞原形 后接帶to的動(dòng)詞原形
直接加not 構(gòu)成否定 用do/does/did not 構(gòu)成否定
直接位于主語(yǔ)前構(gòu)成疑問(wèn) 用do/does /did構(gòu)成疑問(wèn)
He needn’t come if he is busy. You need to concentrate on your sdudy.
Need I repeat what I said just now? Adam needs to finish his work
He could not read and write at the age of three.
She can speak five kinds of foreign languages.
It will be fine next week.
4. 有語(yǔ)態(tài)的變化(被動(dòng)語(yǔ)態(tài))
The tree may be planted in spring.
Teenagers should be allowed to choose their own clothes.
The room must be kept clean.
注：need 與dare，既是情態(tài)動(dòng)詞又是行為動(dòng)詞，其區(qū)別如下：
情態(tài)動(dòng)詞 行為動(dòng)詞
無(wú)人稱(chēng)和數(shù)的變化,無(wú)過(guò)去式 有人稱(chēng)和數(shù)的變化
后接動(dòng)詞原形 后接帶to的動(dòng)詞原形
直接加not 構(gòu)成否定 用do/does/did not 構(gòu)成否定
直接位于主語(yǔ)前構(gòu)成疑問(wèn) 用do/does /did構(gòu)成疑問(wèn)
He needn’t come if he is busy. You need to concentrate on your sdudy.
Need I repeat what I said just now? Adam needs to finish his work