4．---We didn't take part in the social activity yesterday．
---I     ，either，if my teacher hadn't reminded me of it．（　�。�
A．didn'tB．hadn'tC．wouldn'tD．wouldn't have

分析 --我們昨天沒有參加社交活動(dòng)．
--如果老師沒有提醒我的話，我也不會(huì)參加了．

解答 答案：D
根據(jù)題干中謂語動(dòng)詞didn't take part in 和時(shí)間狀語yesterday可知，談?wù)撘患l(fā)生在過去的事情，所以if條件虛擬句中主句的謂語動(dòng)詞形式應(yīng)為would/could/might/should have done．故選D．

點(diǎn)評(píng) if條件從句的虛擬情況有三種形式：①如對(duì)現(xiàn)在情況假設(shè)：if條件從句的謂語動(dòng)詞形式為過去式（be為were），主句的謂語動(dòng)詞形式為would/could/might/should do ②如對(duì)過去情況假設(shè)：if條件從句的謂語動(dòng)詞形式為 had done，主句的謂語動(dòng)詞形式為 would/could/might/should have done ③如對(duì)將來情況假設(shè)：if條件從句的謂語動(dòng)詞形式為were/did；should do；were to do，主句的謂語動(dòng)詞形式為would/could/might/should do．解此類題的關(guān)鍵是要判斷對(duì)什么時(shí)間的假設(shè)，再而做出正確的謂語動(dòng)詞形式．

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