帮我看看这个句子错在哪~How many exercises have you been doing?

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帮我看看这个句子错在哪~How many exercises have you been doing?
How many exercises have you been doing?
这个句子错在哪```

可以改为：
1、What exercises have you been doing?
（你一直在作哪些练习啊?）
或者：
2、How many exercises have you done?
（你已经完成多少练习了?）
而原句“How many exercises have you been doing?”
（你一直在作多少练习啊?）仅从中文意思就可以看出明显是有语法错误的.

帮我看看这个句子错在哪~How many exercises have you been doing? How long have you been doing是什么时态的句子?这个时态怎样构成? how many have you been here How many times have you been here? How long have you been staying here last night.这个句子哪里错了. How many pen do you have 错在哪 how many cup do you have 错在哪? 帮我看看这个英语句子,Whatever is worth doing is worth doing well. have you finished doing all the exercises how long have you been doing that job? Do you want to know my friends how get to school?帮我看看这个句子对不对帮我看看这句子 I have been learn English since this April.