一般疑问句的开头,通常用三类型词开头。
第一类是be动词,is,are,was,were(am除外,am放句首不合常规),如Is he a student? Were they repairing the machine? 等等。第二类词是情态动词,如can,may,must等,如Can you ride a bike? 第三类是助动词,do,does,did,当句子为一般现在时和一般过去时且句中出现普通行为动词时添加这三个助动词帮助构成一般疑问句,如Does he like playing basketball? 如果句中有其它的现成助动词will,would,have,has,had时也可以直接提到句首,如Would you like an apple?