What kinds of certificates are required?”这是一特殊问句,疑问词就是主语里的一部分,所以后面直接加上谓语。如果疑问词不是主语那么疑问词后就要接一般疑问句,如 What kinds of food do you need.(疑问词做宾语的修饰词,所以不同于你给的句子。)如此句变为从句,如下 could you tell me what kind of food you want?(宾语从句用陈述语序) Could you tell me what kinds of certificates are required?这是一个有宾语从句的复合句,宾语从句要用陈述语序,所以是对的。