新概念二册语法精粹第二章 名词
（三）．复合名词复数形式：1．中间没有连字符的合成名词在词尾变复数：
bookshelf→bookshelves handful→handfuls
2．man和 woman构成的复合名词，二者均变为复数。
man servant→men servants
woman teacher→women teachers
3．中间有连字符的合成次，在主体词（中心意义的词）末尾变复数：
sister-in-law→sisters-in-law
looker-on→lookers-on
editor-in-chief→editors-in-chief
4．下列合成名词在后一个词上变化：
sit-in→sit-ins, grown-up→grown-ups
stand-by→stand-bys touch-me-not→touch-me-nots
go-between→go-betweens
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