有一读者问：对下面两个句子中的反意疑问句，我们的理解是：
(1)I think you'll come to our help, won't you?
(2)I don't suppose he cares, does he?
以上两句中的反意疑问句的主语皆与宾语从句的主语一致。但请看下面两个句子：
(3)We don't believe that he can do the work by himself, do we?
(4)Carl thinks you had better clear the ashes away first, doesn't he?
请问如何解释这两个句子中的反意疑问句呢？
第一对句子（即句[1]与句[2]）中的反意疑问句不是对主句提出疑问，而是对宾语从句（即省去 that 的从句）提出疑问。所以反意疑问句的主语和谓语必须与从句的主语和谓语一致，但这种句子必须由“单数第一人称代词（即I）+think, suppose, guess, assume, believe, expect, imagine 等动词”所引导。第二对句子（即句[3] 和句[4]）的开头虽有动词 believe 和 thinks, 但其主语不是I，故其反意疑问句只可对主句提出疑问，不可对从句提出疑问。
