1 both 應放在be動詞、助動詞和情態(tài)動詞的后面,但要放在行為動詞的前面。
They are both students. (正)他們倆都是學生 。
They both are students. (誤)
2 both 可以直接修飾名詞,如both workers(兩個工人),both brother and sister(兄妹倆)。但是,如果both 和定冠詞、形容詞性物主代詞、數詞共同修飾名詞,結構為:both +修飾詞+名詞。
both the workers那兩個工人
both my feet我的兩只腳
both the two brothers那兄弟倆
both her hands她的兩只手
Both the glasses are broken. (正)那兩只玻璃杯都破了 。
The both glasses are broken. (誤)
3 both 同主格代詞和賓格代詞連用時,要放在后面。
They both like the film. 他們兩人都喜歡這部電影。
He lent the books to them both . 他把書借給了他們兩人。
3 both of 后接代詞時,要用賓格,后接名詞時,名詞前必須有定冠詞、物主代詞所有格或其他表示特指意義的限定詞。
Both of them work in the factory. 他們倆都在這家工廠工作。(=They both work...)
Both of the books are hers. 這兩本書都是她的。(=The books are both...)
Both of his parents are doctors. 他父母都是醫(yī)生。(=His parents are both...)
Both of these story-books are worth reading. 這兩本故事書都值得讀。