?、僮髦髡Z時(shí),可單獨(dú)使用,也可以與of連用,其中both接謂語動(dòng)詞要求用復(fù)數(shù)形式；either,neither接謂語動(dòng)詞一般用單數(shù)形式,但這兩者在口語中作主語時(shí),其后的謂語動(dòng)詞也可以用復(fù)數(shù).例如：
Both are right.= Both of the answers are right.這兩個(gè)答案都對.
Either(of them)is OK. (他們兩個(gè)中)任何一個(gè)都行.
②作賓語,可單獨(dú)使用,也可以與of連用,放在動(dòng)詞或介詞之后.例如：
I don't know which book is the better；I shall read both.我不知道這兩本書哪一本好,所以我兩本都讀.
I like neither.(兩個(gè))我一個(gè)也不喜歡.
?、圩鞫ㄕZ,both后面接復(fù)數(shù)名詞,either和neither后面接單數(shù)名詞.例如：
Both answers are right.兩個(gè)答案都對.
On either side of the river there are a lot of trees.河的兩邊都有許多樹.
Neither boy is going there.兩個(gè)男孩兒都不打算去那里.
④both作主語的同位語,一般放在實(shí)義動(dòng)詞前,系動(dòng)詞be、情態(tài)動(dòng)詞、助動(dòng)詞后；作賓語的同位語,直接放在其后(either和neither做同位語的情況較少).例如：
You must both come over this evening.你們倆今晚必須都過來一趟.(作主語you的同位語)
We are both from Chongqing.我們兩個(gè)都來自重慶.(作主語we的同位語)
He helped us both.他幫助了我們兩個(gè)人.(作賓語us的同位語)
