一、教学目标：
1. To recognize and use countable nouns.
2. To master the rules of forms the plural forms of countable.
3. To master how to show the amounts of uncountable nouns.
二、教学重难点：
1. 掌握可数名词的复数形式，包括规则变化和不规则变化。
2. 识别并学会使用可数名词和不可数名词。
3．piece，glass，salt，cup，kilo，carton，bottle ;
a piece of, a glass of, a packet of, two bags of, three cups of, four kilos of, six bottles of ;
What do we need to buy ?
