小学二年级英语语法 可数词的复数形式
Most nouns + s a book -books
Nouns ending in a consonant +y - y+ ies a story-stories
Nouns ending in s, sh, ch or x + es a glass-glasses a watch-watches
Nouns ending in o +s or +es a piano-pianos a mango-mangoes
Nouns ending in f or fe - f or fe +ves a knife -knives a shelf-shelves
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