18.I cleaned my teeth twice before I got to bed last night.(變被動(dòng)語態(tài))My teeth were cleaned twice before I got to bed last night..

分析 昨晚上床睡覺前我刷了兩次牙.
昨晚上床睡覺前,我的牙齒刷了兩次.

解答 答案:My teeth were cleaned twice before I got to bed last night.my teeth是動(dòng)詞clean的承受者,夠成被動(dòng)關(guān)系,結(jié)合時(shí)態(tài)一般過去時(shí)用一般過去時(shí)的被動(dòng)語態(tài)was/were+過去分詞,主語my teeth復(fù)數(shù),故were,clean的過去分詞cleaned,故答案是My teeth were cleaned twice before I got to bed last night.

點(diǎn)評(píng) 一般過去時(shí)的被動(dòng)語態(tài)was/were+過去分詞的呈現(xiàn),課下要理解記憶各種被動(dòng)語態(tài)的構(gòu)成.

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