形容词性物主代词：my our your her his its their

名词性物主代词： mine ours yours hers his its theirs

2.形容词和副词的比较级

(1) 一般在形容词或副词后+er

older taller longer stronger, etc

(2) 多音节词前+more

more interesting, etc.

(3) 双写最后一个字母 ，再+er

bigger fatter, etc.

(4) 把y变i
，再+er

heavier, earlier

(5) 不规则变化：

well-better, much/many-more, etc.

3.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