找错题啊

原题：
1.He asked me how much had I spent on the mountain bike.
2.Do you know what time begins the football match?
3.Mary said she did not heard frome her old classmate since September.
4.The mother asked her son where you had found his lost wallet.
5.Charles asked he could use my car.
6.Mother asked me where I will go the next day.

解答：
1.这是宾语从句,me后省略了引导词that,that引导了从句,从句主谓要到装;
2.(1)what前加at,如果将句子改为一般句:the football match begins time. time前就会缺少介词,这个介词应该是at.
(2)what可以改成when,when就可以代替at waht ,就会避免了介词的问题. 而且从句需要到装应改为 at what time(when)the football match begins;
3.这是宾语从句,主句谓语是said,而且hear这个动作是发生在said之前,所以did 应改为 had;
4.you改为 he ,翻译出来即可明白;
5.he前加if表是否 或 he前加whether,整个句子后加or not ,也表是否. 翻译出来即可.
6.主句谓语动词是asked,表示动作已经发生,整个句子的意思要表达在过去的那个时候我要干什么,应该用过去将来时,将wll改为 would