Dave is a good boy and he always finishes doing his homework on time.
戴夫是个好孩子，他总是按时完成作业。
他正在做他的家庭作业吗？
他正在做他的家庭作业。
He is busy doing his homework.
他正忙着做家庭作业。
Mike has no time to play football now because he is busy doing his homework.
麦克现在没有时间踢足球，因为他正忙于做家庭作业。
For instance, when doing homework, the person who is not determined always can't finish perfectly and even copy from others when he thinks that homework is hard to finish.
例如，做穵作业的时候，没有决心的人总是无法很好的完成作业甚至如果他觉得作业难以完成就会抄袭别人的。
He is doing his homework at home now.
他现在正在家做作业。
He is always slack in doing his homework.
他做作业总是马马虎虎。
He sings as he is doing his homework.
他一边写作业一边唱歌。
And a person only known play, don't think he is doing his homework in deception the teacher, he spoofed himself.
一个人只知道玩乐，认为他不做作业是在欺骗老师时，他欺骗的其实是他自己。
He is always doing his homework.
他总是做不完他的作业！
It is late now, but he goes on doing his homework, doesn't he?
现在天晚了，但是他仍然在继续做作业，不是吗？
He is busy doing his homework.
他正忙于做作业。
No matter how tired he (she) is, he (she) insists on doing his homework. So he (she) gets good marks in all his subjects.
不管他(她)多么累，他(她)都对峙完成他的作业，以是他(她)各科作业都很好。
Don't him he is doing his homework.
当他做作业时别打扰他。
他没有正在做他的作业。
他现在正在做作业。
He is tired of doing his homework.
他对写作业总是很厌倦。
他在做家庭作业吗？
他正忙于做作业。
He is busy with doing homework.
他正忙于做作业。
Tom is doing his homework, and he is very serious.
汤姆正在做作业，他很认真。
Tom is doing his homework, and he is very serious.
汤姆正在做作业，他很认真。
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