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［误］There are two As in this word.
［正］There are two A's in this word.
［析］在大写字母缩写形式的复数表达法中应加s，但如字母是A、I时，为了防止与As和Is相混，则要用's即A's，I's
［误］There are three 6s and two 3s in my telephone number.
［正］There are three 6's and two 3's in my telephone number.
［析］在小写字母与数字的复数形式表达法中要用's
［误］We have many woman teachers in our school.
［正］We have many women teachers in our school.
［析］一般组合名词变为复数形式时只将词中心词变为复数如：
half brother—half brothers(同父异母或同母异父的兄弟)daughter in law—daughtersin law,(儿媳)但要注意的是：man driver—men drivers(男司机) woman doctor—women doctors(女大夫)grown up—grown ups(成年人) 但是boy student—则变为boy students
［误］Physics are very difficult to learn.
［正］Physics is very difficult to learn.
［析］虽以s结尾但只能用作单数名词有：科学，学科名字：Physics. Mathematics politics游戏名称：bowls 专有名称：Niagara Falls(尼亚加拉瀑布) 其他名词：news(消息，新闻)
［误］There is a people in the room.
［正］There is a person in the room.
［正］There is a man in the room.
［析］people是复数名词，不可用作单数，如要用来讲一个人时应用a person, a man, a woman。同样的词有police.要讲一个警察时则要用a policeman, a policewoman。
［误］Where is my shoe?
［正］Where are my shoes?
［析］常常只用作复数形式的词有trousers, pants, shorts(短裤)，socks(袜子),shoes, gloves(手套)。但如果只找其中的一个则要指明，这时还是应用单数形式。如：Where's my left glove?(我左手的手套在哪?)
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