1 a number of 相當于many,意為“許多”,也可以說a large number of或a small number of (不多),后跟復數(shù)名詞或代詞,謂語動詞用復數(shù)。a number of 還可表示“若干”。
A number of children are playing on the grass. 許多兒童在草地上玩。
I have a large number of books to read. 我有許多書要讀。
Only a small number of students like the film. 僅有一小部分學生喜歡這部電影。
2 the number of 表示“……的數(shù)目”,of 后跟復數(shù)名詞。在這個結(jié)構(gòu)中,the number 是主語,謂語動詞要用單數(shù)。
The number of students in this class is 40. (正)這個班的學生數(shù)是40 。
The number of students in this class are 40.(誤)
比較
A number of books are on the desk. 有許多書在桌子上。
The number of books is rising. 書的數(shù)量在增加。