助动词就是帮助行为动词构成否定和疑问的无意义的动词.do(does/did)----一般现在时中和过去时中：Do you want to go with me?I don't go with you.Did she finish her homework?Does Xiaoli listen to the radio eve...我想问助动词分别用字句子中的具体的哪个位置