1.當(dāng)詞與數(shù)字連用時(shí),通常不加復(fù)數(shù)詞尾-s,也不后接介詞 of.如：
I want three score eggs.我要60只雞蛋.
He is a man of three score years.他六十歲.
Two hundred (thousand) students went there.有兩百(千)學(xué)生去了那兒.
注：有人 score,dozen 之后有時(shí)也接 of,但慣用法省略 of 則常見.
當(dāng) million 用作中心詞(即其后不接名詞或數(shù)詞)時(shí),有時(shí)也可帶復(fù)數(shù)詞尾-s.如：
The population of New Zealand is now three million(s).新西蘭現(xiàn)有人口三百萬.
2.當(dāng)詞不與數(shù)字連用,而是表示不的泛指數(shù)時(shí),則要加復(fù)數(shù)詞尾-s,而且要后接介詞 of,然后才能接名詞.如：
I’ve read it dozens (scores) of times.我讀過它幾十次.
Thousands of students entered the contest.數(shù)千名學(xué)生參加了這次比賽.
Millions of people died in the war.有數(shù)百萬人次戰(zhàn)爭中喪生.
注：若不名詞,則不用介詞 of.如：
Millions (of people) are homeless.千千萬萬的人無家可歸.
3.當(dāng)詞與 a few,several,many 等數(shù)目不很的詞連用時(shí),帶不帶復(fù)數(shù)詞尾 -s 均可,注意：若不帶復(fù)數(shù)詞 -s,其后的介詞 of 可以省略；若帶復(fù)數(shù)詞尾-s,則其后介詞 of 省略.如：
在那兒我見到了數(shù)百外賓.
正：There I saw several hundred(s) of foreign guests.
正：There I saw several hundred foreign guests.
注意 some hundred persons 與 some hundreds of persons 含義不同：前者指“大約一百人”,some＝about a；后者指“幾百人”.
4.當(dāng)詞后面的名詞有了 the,these,those等特指限定詞修飾時(shí),或其后的接的是 us,them 的人稱代詞時(shí),則此時(shí)用介詞 of.如：
two dozen of them 它們中的兩打
three scores of these eggs 雞蛋中的三打
five hundred of the workers 工人中的五百人
5.注意與介詞 by 連用的例子：
The eggs are sold by the dozen.雞蛋按打出售.
The ants arrived at the picnic by the hundred(s).成群的螞蟻來到野餐的地方.
They were sold by the thousand(s).它們被大批大批地(論千地)出售.
Pack them in dozens.把它們成打地包起來(即每12個(gè)一包).