（四）．名词所有格
1．在大多数名词末加“'s”
the boy's toy, men's work
2．以 s结尾的复数名词直接加“'”
the students' reading room
3．以 s结尾的单数名词加“'”
Dickens' novels the actress' performance
4．合成名词在最后一个词上加“s”
her brother-in-law's piano.
Somebody else's books. （重要！）
【金牌重点】：除用于有生命的人外，“'s”格还可用于度量衡、地域、天体及一些习语中：
an hour's drive, a mile's journey
ten pounds' weight.
the earth's surface
a stone's throw 投石之距离
at one's wits end 智穷计尽
to one's heart's content 尽情地
by a hair's breadth 千钧一发
at a snail's pace 缓慢地 joozone.com