当谓语是实意动词也叫行为动词的时候，可以不需要be动词，例如：He goes to school every day. 这里的go 就是行为动词，当行为动词做谓语的句子变疑问句时，要借助动词 do 或does ( 主语是三单)Does he go to school every day? Do you like apples?
