Question

观察下列句子，试着归纳其画线部分所包含的句型结构。

1．While walking the dog, you were careless and it got loose and was hit by a car．(P1, 4)

______________________________

2．You will tell him/her that he/she should have studied, so you don’t let him/her look at your paper．(P1, 5)

______________________________

3．…but your friend can’t go until he/she finishes cleaning the bicycle．(P1, Warming Up 1)

______________________________

Answer 1

答案：
解析：

1．while引导的状语从句中的主语如果和主句的主语一致，从句可以省略主语和部分谓语。 　　2．should have done表示“过去本应该做某事，而实际上没做”。 　　3．(not…)until/till