变一般疑问句,在句首加助动词do/does/did的情况是：句子中的谓语动词是实义动词或行为动词.如：He goes to school every day--Does he go to school every day?
但是,如果原句中已经有助动词或情态动词,就只能将这个助动词或情态动词调到句首.如：
He will come and help you soon.---Will he come and help me soon?
He can play basketball well---Can he play basketball well?