33.　 It takes sb.some time to do sth.　 (It often takes her mother half an hour to cook.)

32.　 come for dinner = come to have dinner

31.　 make a shopping list

30.　 可数名词与不可数名词；　

可数名词复数构成：book---　　　; story---　　　; watch---　　　 ; piano---　 ;

　　　　　　　　 shelf---　　　; knife---　　　; mango---　　　; potato---　 ;

29.　 the difference between the girls’ and the boys’eating habits

28.　 give some advise on exercise

27.　 频率副词(由强到弱)：always----usually----often----sometimes----seldom----never

26.　 How does it taste?　 Mooncakes taste sweet, and vinegar tastes sour.

25.　 How much do you know about food?

24.　 How often / How long / How many times

How often do they eat these kinds of food?

How many times do they eat these kinds food in a week?

How long do they exercise every day?