(1)“名词＋名词”构成的合成名词，一般情况下，主体名词变成相应的复数形式。如： boy friend→boy friends 男朋友；passerby→passersby 过路人。如果man和woman为前缀的名词变成复数时， 前后两个名词都变成复数。如：man doctor→men doctors 男医生
(2)有些合成名词无主体名词，则在最后一个词的词尾加s或es，如：grownup→grownups成年人
[即时演练1] 根据句意写出合成词
①To close your document, press CTRL＋W on your keyboard(键盘)．
②This film is the first British animation sold to an American network(网络)．
③Talk quietly in the reading-room(阅览室)in order not to disturb others.
④Have you ever been to that worldfamous(世界著名的)university?
⑤Alice is such a goodlooking(长得好看的)girl that she is considered the class beauty.
