1 The stident was running to move the bag of rice ( )he heard th sound of a bike.

1 The stident was running to move the bag of rice ( )he heard th sound of a bike.

题目
1 The stident was running to move the bag of rice ( )he heard th sound of a bike.
2 What was your father doing ()your mother was cooking in the kitchen.第一题为什么用when不用while.第二题为什么用while 不用when?
答案
while后面一定是进行时,when是过去式,我们老师是这么讲的.
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