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

分析 所有的馬鈴薯都已經(jīng)壞了,扔掉它們.

解答 答案:potatoes.句中的all表示所有的,后加名詞復(fù)數(shù)或不可數(shù)名詞,potato是可數(shù)名詞,復(fù)數(shù)是potatoes,故答案是potatoes.

點(diǎn)評(píng) 名詞單數(shù)變復(fù)數(shù)變化規(guī)則:
 1.一般名詞復(fù)數(shù)是在名詞后面加上"s",如map→maps,bag→bags,book-books等;  
2.以s,x,sh,ch結(jié)尾的詞加"es",如bus→buses,watch→watches,box-boxes等;  
3.以f或fe結(jié)尾的名詞變復(fù)數(shù)時(shí),去掉f,fe 加ves的名詞有:half→halves knife→knives  leaf→leaves wolf→wolves  wife→wives  life→lives  thief→thieves 
4.以o結(jié)尾的名詞變復(fù)數(shù)時(shí):
a)加s的名詞有(無(wú)生命):photo→photos,piano→pianos,radio→radios b)加es的名詞有(有生命):potato→potatoes tomato→tomatoes

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