31. The teacher _________（not teach）us a Chinese song，he ________（teach）us an English song two days ago.
32. If I am free this evening，I ________（help）you with your maths.
33. ________you ________（be）there tomorrow? No，I ________.
34. Where _________（be）your parents last year? They ________（be）in Xi'an.
35. Why _______ they _______（go）to the library after school yesterday? Because they _________（want）to borrow some books.
36. What _______ you _______（do）these days?
37. Don't make a noise. Grandma _________（sleep）.
38. Sometimes he _________（help）his mother with the housework.
39. Please write to us as soon as you _________（get）there.
40. We ________（show）the foreign friends around Beijing when they get here.
參考答案:31.doesn't teach taught
32.will help
33.Will be won't
34.did were
35.did go wanted
36.do do
37.is sleeping
38.helps
39.get
40.show
