.以不可數(shù)名詞結(jié)尾的復(fù)合名詞無(wú)復(fù)數(shù)形式.
如：homework,newspaper等.
2.以man或woman為前綴的名詞變復(fù)數(shù)時(shí),前后兩個(gè)名詞都變成復(fù)數(shù).
如：woman doctor→women doctors,man waiter→men waiters.
3.以兩個(gè)名詞構(gòu)成的復(fù)合名詞(前面的名詞為man或woman除外),一般把后面的名詞變復(fù)數(shù).
如：boy friend→boy friends,paper bag→paper bags.
4.以“可數(shù)名詞+介詞(短語(yǔ))”構(gòu)成的復(fù)合名詞變復(fù)數(shù)時(shí),把前面名詞變復(fù)數(shù).
如：father-in-law→fathers-in-law.
5.以“動(dòng)詞 / 過(guò)去分詞+副詞”構(gòu)成的復(fù)合名詞變復(fù)數(shù)時(shí),在詞尾加s.
如：grown-up→grown-ups,stand-by→stand-bys.
6 以“man” "woman"等構(gòu)成的復(fù)數(shù)名詞,兩個(gè)都要變復(fù)數(shù)
man doctor →men doctors
woman teacher →women teachers