當(dāng)陳述部分含有 must 時(shí), 要注意 must 的含義. 表示 "一定要, 必須"時(shí), 反意疑問句附加部分用 mustn't 或 needn't
e.g. He must work hard at physics, mustn't he?
You must renew the book, needn't you?
表示推測(cè) "一定是, 必定是"時(shí), 反意疑問句附加部分有下列情況:
A). 當(dāng)陳述部分有 must be ...時(shí), 反意疑問句附加部分用 be 的現(xiàn)在時(shí)態(tài).
e.g. He must be very tired, isn't he?
He must be working hard at the office, isn't he?
B). must have + 過去分詞 表示對(duì)過去的推測(cè)
a). 單純表示對(duì)過去的推測(cè), 與現(xiàn)在無關(guān), 反意疑問句附加部分用過去式.
b). 表示對(duì)過去的推測(cè)且影響到現(xiàn)在或持續(xù)現(xiàn)在, 反意疑問句附加部分用現(xiàn)在完成式.
e.g. He must have come yesterday, didn't he?
You must have studied English for years, haven't you?
He must have lived here at least ten years, hasn't he?
你那后面填的是mustn't you或needn't you