一般的賓語從句的反義疑問句，反問的是主句
Some students don't understand why they have to learn English at school, do they?
但是如果主句動詞為think, believe, suppose, imagine, expect, reckon, assume等詞，並且主句主語為第一人稱時，反義疑問句應該反問從句
I think they don't understand the importance of learning a foreign language, do they?
但是這些詞引導賓語從句，主語為非第一人稱時，就應該反問主句
Mary thinks we must finish it on time, doesn't she?
一般的賓語從句的反義疑問句，反問的是主句
Some students don't understand why they have to learn English at school, do they?
但是如果主句動詞為think, believe, suppose, imagine, expect, reckon, assume等詞，並且主句主語為第一人稱時，反義疑問句應該反問從句
I think they don't understand the importance of learning a foreign language, do they?
但是這些詞引導賓語從句，主語為非第一人稱時，就應該反問主句
Mary thinks we must finish it on time, doesn't she?