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