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19.All thepotatoes(potato) have gone bad.Throw them away.

分析 所有的马铃薯都已经坏了,扔掉它们.

解答 答案:potatoes.句中的all表示所有的,后加名词复数或不可数名词,potato是可数名词,复数是potatoes,故答案是potatoes.

点评 名词单数变复数变化规则:
 1.一般名词复数是在名词后面加上"s",如map→maps,bag→bags,book-books等;  
2.以s,x,sh,ch结尾的词加"es",如bus→buses,watch→watches,box-boxes等;  
3.以f或fe结尾的名词变复数时,去掉f,fe 加ves的名词有:half→halves knife→knives  leaf→leaves wolf→wolves  wife→wives  life→lives  thief→thieves 
4.以o结尾的名词变复数时:
a)加s的名词有(无生命):photo→photos,piano→pianos,radio→radios b)加es的名词有(有生命):potato→potatoes tomato→tomatoes

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