【文章內(nèi)容簡介】 過去式（be通常用were），主句謂語用“should （would, could, might）+動詞原形” 與過去事實相反 若與過去事實相反，條件從句的謂語用過去完成時（had+過去分詞），主句謂語用“should （would, could, might）+have+過去分詞”與將來事實相反 若與將來事實相反，條件從句的謂語用過去式（be通常用were），主句謂語用“should （would, could, might）+動詞原形”。19． If I ____Alice, I _____them the truth.A. was , would tell B. were ,would tell C. am, will tell D．is , will tell【答案】B【解析】試題分析：本題的含義是如果我是你，我將告訴他們真相，本題if引導的是一個虛擬的條件句，在虛擬句中，be用were，主句通常用過去的一種，will應該用would，故本題選B。考點：if引導的虛擬條件句。點評：在英文中條件句有兩種，一種是真實的條件句，if后遇到將來時用一般現(xiàn)在時，一種是虛擬的條件句，if后用過去時，be用were，在英文的實際使用中應該注意它們的區(qū)別。20．What would you do if you ____ a million dollars?I’d give it to the charityA．win B．won C．will win D．is to win【答案】B【解析】試題分析：句意：如果你贏了一百萬美元，你要做什么？——我會把它捐給慈善機構。結合語境可知條件從句中描述的是與將來相反的事實，故用一般過去時態(tài)，選B。考點：if引導的條件狀語從句點評：虛擬語氣是一種特殊的動詞形式，用來表示說話人所說的話并不是事實，而是一種假設、愿望、懷疑或推測。判斷是真實條件句還是非真實條件句。只有在非真實條件句中才使用虛擬語氣。通過句子意思，看假設的條件是否能夠實現(xiàn)，能夠實現(xiàn)是真實條件句，不能使用虛擬語氣；假設的條件不能實現(xiàn)則是非真實條件句。與現(xiàn)在事實相反 若與現(xiàn)在事實相反，條件從句的謂語用過去式（be通常用were），主句謂語用“should （would, could, might）+動詞原形” 與過去事實相反 若與過去事實相反，條件從句的謂語用過去完成時（had+過去分詞），主句謂語用“should （would, could, might）+have+過去分詞”與將來事實相反 若與將來事實相反，條件從句的謂語用過去式（be通常用were），主句謂語用“should （would, could, might）+動詞原形”：21． If I_______ one million dollars, I would give it to medical research. If I _______ you, I would give it to charity.A．will have, am B．would have, was C．had, were D．have, is【答案】C【解析】考察虛擬語氣。第一空，虛擬語氣，與現(xiàn)在相反，用過去時。第二空，虛擬語氣，與現(xiàn)在相反，用過去時，be動詞用were。故選C22．You should_______ watched TV. There is so much work to do,A．not have B．have not C．not D．not having【答案】A【解析】句意“你本不應該看足球比賽，你有許多的工作要做”。本題考查虛擬語氣，shouldn39。t have done本不該做……卻做了。根據(jù)句意，故選A。23．Mr. White _____ at 8:30 for the meeting, but he didn39。t show up.A．should have arrived B．should arriveC．should have had arrived D．should be arriving【答案】A【解析】試題分析：句意：懷特先生本來應該在8：30到會，但他卻沒有出現(xiàn)。should have done：本來應該做某事而實際上沒做。故選A考點：情態(tài)動詞24．If I not so busy ,I with you .A．was , would go B．were , would goC．was , should go D．were , will go【答案】B【解析】句意“如果我不忙，我就跟你去”。本題考查對將來的虛擬語氣。即“if+過去時，主語+should/would/could/might do”結構。故選B。點睛：虛擬情況從句主句對現(xiàn)在的虛擬過去式（be一般用were）should/would/could/might+do對過去的虛擬had+過去分詞should/would/could/might+have done對將來的虛擬過去式（be一般用were）should/would/could/might+doshould+動詞原形were+to do25． If I _______ you , I _______ do that .A．was , would B．were 。 wouldn’tC．a(chǎn)m , won’t D．were , won’t【答案】D【解析】試題分析：句意：如果我是你，我不會那樣做。本句是與現(xiàn)在事實相反的虛擬條件句，從句謂語用動詞用過去式（be動詞一般用were）；主句用should（would,could,might）+ 動詞原形。故選D?？键c：虛擬條件句。26．If I you, I invite him to go to see a movie.A．a(chǎn)m, would B．were, willC．were, would D．was, will【答案】C【解析】試題分析：句意：句意：如果我是你，我會邀請他去看電影。go to see a movie去看電影；invite sb to do邀請某人做某事；在表達與現(xiàn)在事實相反的虛擬語氣中，Be用were,主句用would。所以選C。考點：考查虛擬語氣。27．What would you do if you _____ the traffic accident?I would ______.A．see,do my housework first B．saw。buy some fruit right awayC．see。call at 110 at once D．saw。call the police right away【答案】D【解析】考查虛擬語氣和情境交際的用法。問句使用了虛擬語氣，從句中應使用一般過去時；根據(jù)traffic accident，應及時報警。28．What_____you do if you had a million dollars ? A．would B．will C．did D．do【答案】A【解析】考查點：虛擬語氣。解題思路：根據(jù)句意:如果你有一百萬你將會干什么？ “如果你有一百萬”是對現(xiàn)在的一種假設，與現(xiàn)在的事實相反。表示與現(xiàn)在事實相反的虛擬語氣的結構是：主句用should/would/could/might+動詞原形，從句用一般過去時態(tài)。故選A。29．—Swimming in the river for teenagers is very dangerous.—So it is. If I ________ them,