作业帮12、13题.
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12、13题.
1 was playing ; were sing
注：at 10 yesterday 与 while 是答题的关键
2 will take
注：in two hours 常与一般将来时连用； 飞机起飞与降落不用被动语态.
加油!不明白再问!
再问： 答案我知道了，正确，能不能用通俗一点的话给我解释解释，什么时候用when什么时候用while。谢啦。
再答： while 后的动词一般是持续性动词，常用进行时；表示两个动词同时进行；或当一个动词正在进行时，另一个动词发生了。如 He is reading while his mother is cooking . The bell rang while he was doing his homework. when 的用法：当一个动作发生时另一个动词正在进行；或主语是一般将来时时，从句用一般现在时，或两个时态同时发生。如 The students were talking when the teacher came into the classroom. I will tell you when he comes back. Could you read when you were 3 years old .
注：at 10 yesterday 与 while 是答题的关键
2 will take
注：in two hours 常与一般将来时连用； 飞机起飞与降落不用被动语态.
加油!不明白再问!
再问： 答案我知道了，正确，能不能用通俗一点的话给我解释解释，什么时候用when什么时候用while。谢啦。
再答： while 后的动词一般是持续性动词，常用进行时；表示两个动词同时进行；或当一个动词正在进行时，另一个动词发生了。如 He is reading while his mother is cooking . The bell rang while he was doing his homework. when 的用法：当一个动作发生时另一个动词正在进行；或主语是一般将来时时，从句用一般现在时，或两个时态同时发生。如 The students were talking when the teacher came into the classroom. I will tell you when he comes back. Could you read when you were 3 years old .