【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(dòng)詞原形” 與過去事實(shí)相反 若與過去事實(shí)相反，條件從句的謂語用過去完成時(shí)（had+過去分詞），主句謂語用“should （would, could, might）+have+過去分詞”與將來事實(shí)相反 若與將來事實(shí)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(dòng)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(dǎo)的是一個(gè)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(yīng)該用would，故本題選B。考點(diǎn)：if引導(dǎo)的虛擬條件句。點(diǎn)評(píng)：在英文中條件句有兩種，一種是真實(shí)的條件句，if后遇到將來時(shí)用一般現(xiàn)在時(shí)，一種是虛擬的條件句，if后用過去時(shí)，be用were，在英文的實(shí)際使用中應(yīng)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(huì)把它捐給慈善機(jī)構(gòu)。結(jié)合語境可知條件從句中描述的是與將來相反的事實(shí)，故用一般過去時(shí)態(tài)，選B?？键c(diǎn)：if引導(dǎo)的條件狀語從句點(diǎn)評(píng)：虛擬語氣是一種特殊的動(dòng)詞形式，用來表示說話人所說的話并不是事實(shí)，而是一種假設(shè)、愿望、懷疑或推測。判斷是真實(shí)條件句還是非真實(shí)條件句。只有在非真實(shí)條件句中才使用虛擬語氣。通過句子意思，看假設(shè)的條件是否能夠?qū)崿F(xiàn)，能夠?qū)崿F(xiàn)是真實(shí)條件句，不能使用虛擬語氣；假設(shè)的條件不能實(shí)現(xiàn)則是非真實(shí)條件句。與現(xiàn)在事實(shí)相反 若與現(xiàn)在事實(shí)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(dòng)詞原形” 與過去事實(shí)相反 若與過去事實(shí)相反，條件從句的謂語用過去完成時(shí)（had+過去分詞），主句謂語用“should （would, could, might）+have+過去分詞”與將來事實(shí)相反 若與將來事實(shí)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(dòng)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(shí)。第二空，虛擬語氣，與現(xiàn)在相反，用過去時(shí)，be動(dòng)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(yīng)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(yīng)該在8：30到會(huì)，但他卻沒有出現(xiàn)。should have done：本來應(yīng)該做某事而實(shí)際上沒做。故選A考點(diǎn)：情態(tài)動(dòng)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(duì)將來的虛擬語氣。即“if+過去時(shí)，主語+should/would/could/might do”結(jié)構(gòu)。故選B。點(diǎn)睛：虛擬情況從句主句對(duì)現(xiàn)在的虛擬過去式（be一般用were）should/would/could/might+do對(duì)過去的虛擬had+過去分詞should/would/could/might+have done對(duì)將來的虛擬過去式（be一般用were）should/would/could/might+doshould+動(dòng)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(huì)那樣做。本句是與現(xiàn)在事實(shí)相反的虛擬條件句，從句謂語用動(dòng)詞用過去式（be動(dòng)詞一般用were）；主句用should（would,could,might）+ 動(dòng)詞原形。故選D?？键c(diǎn)：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(huì)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(dá)與現(xiàn)在事實(shí)相反的虛擬語氣中，Be用were,主句用would。所以選C?？键c(diǎn)：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(yīng)使用一般過去時(shí)；根據(jù)traffic accident，應(yīng)及時(shí)報(bào)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(diǎn)：虛擬語氣。解題思路：根據(jù)句意:如果你有一百萬你將會(huì)干什么？ “如果你有一百萬”是對(duì)現(xiàn)在的一種假設(shè)，與現(xiàn)在的事實(shí)相反。表示與現(xiàn)在事實(shí)相反的虛擬語氣的結(jié)構(gòu)是：主句用should/would/could/might+動(dòng)詞原形，從句用一般過去時(shí)態(tài)。故選A。29．—Swimming in the river for teenagers is very dangerous.—So it is. If I ________ them,