問您一道您回答過的英語選擇題,我沒看懂您的答案,
Tom has been writing letters all afternoon,but he should have finished them by now,
______?
a.hasn’t he b.has he c.shouldn’t he d.didn’t you
您的答案是這樣的：解析如下：
此句陳述部分是表轉(zhuǎn)折關(guān)系的并列句,附加疑問句則需和就近的分句的主語和謂語一致.由此可以判斷應(yīng)該對(duì)后半句進(jìn)行反問.
Tom has been writing letters all afternoon,but he should have finished them by now,______?
湯姆整個(gè)下午都在寫信,那他現(xiàn)在應(yīng)該寫完了,_是嗎___?
b.has he 不符合反意疑問句前肯后否的原則
d.didn't you 時(shí)態(tài)和人稱都不符合答案
a.hasn't he?如果此選項(xiàng)可選那么應(yīng)改為如下形式
but he should finish them by now,______?
即should do 表示對(duì)現(xiàn)在的推測,而反意疑問句要對(duì)即存事實(shí)進(jìn)行反問,所以為
hasn't he?此用法可參照Must 在反意疑問句中的用法.
而原文 he should have finished ...其中的"should"就是一個(gè)單純的情態(tài)動(dòng)詞
修飾現(xiàn)在完成時(shí).表推測和表虛擬都與"by now"時(shí)態(tài)不符.
我不懂的地方：解析的倒數(shù)兩行沒看懂.為什么should是修飾現(xiàn)在完成時(shí)的情態(tài)動(dòng)詞,為什么要對(duì)should進(jìn)行反義疑問,而表推測ihe表虛擬與by now從哪里看出不符.