第九講第九講 情態(tài)動詞與情態(tài)動詞與 虛擬語氣虛擬語氣must do對現(xiàn)在或未來的事進(jìn)行猜測對現(xiàn)在或未來的事進(jìn)行猜測must be doing對正在進(jìn)行的事進(jìn)行猜測對正在進(jìn)行的事進(jìn)行猜測must have done對已經(jīng)發(fā)生的事進(jìn)行猜測對已經(jīng)發(fā)生的事進(jìn)行猜測must have done“(過去過去)一定做過一定做過”；語氣比較；語氣比較肯定；用于肯定句肯定；用于肯定句may (might) have done“(過去過去)可能做過可能做過”；語氣不確；語氣不確定；用于肯定句和否定句定；用于肯定句和否定句can (could) have done用于否定句和疑問句，表示懷疑或用于否定句和疑問句，表示懷疑或不確定不確定could have done過去本可以做某事但實(shí)際上沒做過去本可以做某事但實(shí)際上沒做neednt have done過去本不必做某事但實(shí)際上做了過去本不必做某事但實(shí)際上做了ought to/should have done過去本應(yīng)該做某事但實(shí)際上沒做過去本應(yīng)該做某事但實(shí)際上沒做oughtnt to/shouldnt have done過去本不應(yīng)該做某事但實(shí)際上做了過去本不應(yīng)該做某事但實(shí)際上做了might have done過去可能做某事但實(shí)際上沒做過去可能做某事但實(shí)際上沒做情況情況從句謂語動詞從句謂語動詞主句謂語動詞主句謂語動詞與現(xiàn)在與現(xiàn)在事實(shí)相反事實(shí)相反過去式過去式(be用用were)should/would/could/might動詞原形動詞原形與過去與過去事實(shí)相反事實(shí)相反had過去分詞過去分詞should/would/could/might have過去分詞過去分詞與將來與將來事實(shí)相反事實(shí)相反過去式過去式(be用用were)should/would/could/might動詞原形動詞原形should動詞原形動詞原形were to動詞原形動詞原形情況情況從句謂語動詞從句謂語動詞與現(xiàn)在事實(shí)相反與現(xiàn)在事實(shí)相反過去式過去式(be動詞一般用動詞一般用were)與過去事實(shí)相反與過去事實(shí)相反had過去分詞過去分詞與將來事實(shí)相反與將來事實(shí)相反would/could動詞原形動詞原形句型結(jié)構(gòu)句型結(jié)構(gòu)過去虛擬過去虛擬現(xiàn)在虛擬現(xiàn)在虛擬將來虛擬將來虛擬if only引導(dǎo)的條引導(dǎo)的條件句及感嘆句件句及感嘆句had過過去分詞去分詞過去式過去式(be動詞動詞一般用一般用were)would/could/should/might動詞原形動詞原形It is (high) time (that) .過去式或過去式或“should動詞原形動詞原形”專題過關(guān)訓(xùn)練