a piece of? 一塊琴锭，一張，一片葛圃，不可數
a loaf of? ?一條
a bar of? ? 一塊
a bottle of????一瓶
a pound of? ? 一磅
a quarter of? ? 四分之一
a tin of? ? 一罐舔腾，一盒
a carton of? ? 一盒
a flock of? ? 一群
make the tea
ask sb. （sth.）問某人（某事）
go and ask him????go and ask him the way????
ask sb. to do sth.????讓某人做某事
Don't ask him to type the letter.? ? ask him to go.
ask sb. for sth.? ? 問某人要某物
A beggar asks him for money.? ? You can ask him for help.
