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His work has been finishedThe reason had been explained before they made their choices.情態(tài)動(dòng)詞+被動(dòng)語態(tài)This work can be easily done.Your work must be handed in tomorrow. 注意: 情態(tài)動(dòng)詞的被動(dòng)語態(tài)結(jié)構(gòu)為:情態(tài)動(dòng)詞+be+過去分詞其時(shí)態(tài)及句型的變化僅由情態(tài)動(dòng)詞完成,be+過去分詞部分不變。如: Tables can be made of 。 Tables could be made of stone at that 。(一般過去時(shí)) Can tables be made of stone? 桌子能用石頭制造嗎?(疑問句) 特殊情況的被動(dòng)語態(tài) 主謂賓+省略to的不定式(即賓補(bǔ)):使役動(dòng)詞、感官動(dòng)詞(后接動(dòng)詞原形) Eg. We hear him sing the same song all day.此類情況變?yōu)楸粍?dòng)語態(tài)時(shí),原來省略的to一定要加上?! 〕R姸陶Z:make sb do sth →sb be made to do sth (主動(dòng)語態(tài)不含to,被動(dòng)語態(tài)必須帶to) hear sb do sth →____________________ see sb do sth →_____________________have sb do sth →_____________________ *特殊:let sb do sth →sb be let do sth (主動(dòng)語態(tài)和被動(dòng)語態(tài)都不含to) 練習(xí):He made the workers work 12 hours a day. ___________________________________ His mother mad