1 我来北京三年了.
2 他离家两个星期了.
3 凯特买这件衣服三天了.
4 会议结束半小时了.
5 countable nouns.
6 uncountale nouns.
7 either countable or uncountable nouns.
參考答案:1.I have been in Beijing for three years.
2.He has been away from home for two weeks.
3.Kate has have that piece of clothes for three days.
4.The meeting has been off for half an hour.
5.可数名词
6.不可数名词
7.或者为可数名词或者为不可数名词
