69-70. 可数和不可数 Countable and uncountable

比较简单就先不写了

80. Noun + noun (a tennis ball/ a headache)

两个名词组合在一起来表示一个事务。第一个名词相当于是形容词。

a tennis ball

income tax

the city center

有时候第一个单词以-ing形式出现。

a frying pan

a washing machine

a swimming pool

有时候不止2个名词:

I waited at the hotel reception desk.

有时候两个单词合起来写，有时候是分开写的。这个没有清楚的规则，如果你确定的话，可以全部都分开来写。

a headache

toothpaste

a weekend

a car park

a road sign

a three-hour journey (not hours)

a ten-pound note (not punds)

81. -'s (your sister's name) and of ... (the name of the book)

-'s 一般用在人和动物后面。

-'s**后面可以没有名词：

This isn't my book. It's my sister's.

-'s不能和一大串单词一起用，比如

the name of the womansitting by the door.

单数的名词后面用-'s，复数的名词如果以s结尾的用(')。

my sister's room

my sisters' room （two or more sisters）

the men's changing room

-'s可以用在多个名词后面。

Jack and Karen's wedding.

-'s可以用在地理位置上。

The city's streets

可以用在时间上。

Do you still have yesterday's newspaper?

I've got a week's holiday starting on Monday.

of一般用在事物和想法等。

The temperature of the water. (不能说 water's temperature，但是可以说 the water temperature，参考Unit 80.)

还可以说 the beginning/end/middle of... / the top/bottom of ... / the front/back/side of ....

对于组织， 's和of都可以用。

The government's decision

the decision of the government