2019年高考英語二輪專題復習6情態動詞和虛擬語氣
主句動詞：should/would/could/might+動詞原形 if it should rain tomorrow, we would not go camping.
注意:主句中的should只用于i、we，但在美國英語中，should常被would代替；從句中的should可用于各種人稱，且不可以被would所代替。
（二）混合虛擬結構
1.不同時間的虛擬
if he had listened to me, he would not be in trouble now.（從句與過去事實相反，主句與現在事實相反）
if he had told me yesterday, i should know what to do now. （從句與過去事實相反，主句與現在事實相反）
if i were you, i would have gone to her birthday party. （從句與現在事實相反，主句與過去事實相反）
if you hadn’t lent me some money, i couldn’t have bought the new house and most likely i would be still living in the dangerous house now. （從句與過去事實相反，and后面的主句與現在事實相反）
2.虛擬與陳述的混合
he could have passed the exam, but he wasn’t careful enough.
you should have come earlier. the bus left a moment ago.
（三）特殊句式虛擬結構
1.省略連詞if。在書面語中，如果虛擬條件從句中有were，had 或 should，可以把if省略，把這幾個詞放到主語之前，構成主謂倒裝。
should he come (if he should come), tell him to ring me up. 他要是來了，讓他給我打個電話。
were i you (if i were you), i would not do it. 我要是你，就不做這事。
2.suggest, order, propose, request, require, demand, advise, insist+ 賓語從句(should )do
he suggested that we (should) save money for the future.
the undergraduate insisted that he (should) go to work in the south.
注意：當suggest表示暗示，insist表示堅持觀點,事實時，后接的賓語從句應當用真實語氣。
his silence suggested that he agreed with my decision.
he insists that doing morning exercises does good to people’s health.
3.it is suggested/advised/ordered/requested/required…+ that從句(should) do
it is proposed that more students should go to university.
4.my advice/suggestion/request/requirement/order/proposal…+ is +表語從句(should)do
my advice is that you should practise speaking english as often as possible.
the order from the commander was that the troops should set off for the front immediately.
5.his suggestion/advice/request/requirement…+ 同位語從句(should )do+ is..
the request that they should get more is reasonable.
6.it is natural/necessary/strange +that從句 (should) do表驚奇、懷疑、惋惜、不滿、理應如此等。
it’s strange that he should have missed the train. （表竟然）
it is important that we should learn from others.（表理應如此）
it is a pity that he should not go with us.(表驚訝、不滿)
7.wish + that clause (did/were 與現在相反)