18．A middle school student invented a new robot last term．（改為被動(dòng)語態(tài)）
A new robotwasinventedby a middle school student last term．

分析 一個(gè)中學(xué)生上學(xué)期發(fā)明了一個(gè)新的機(jī)器人．
一個(gè)新的機(jī)器人上學(xué)期被一個(gè)中學(xué)生發(fā)明了．

解答 答案：was invented
首先注意時(shí)態(tài)，根據(jù)時(shí)間狀語last term可知為過去的時(shí)間，本句是對(duì)過去事實(shí)的一般描述，需用一般過去時(shí)；根據(jù)所給的句子，原句為主動(dòng)語態(tài)，要求改為被動(dòng)語態(tài)，被動(dòng)語態(tài)中主語為動(dòng)作的承受者，本句動(dòng)作的承受者為a new robot，后加be動(dòng)詞+過去分詞，表示"被發(fā)明"，考慮時(shí)態(tài)，此處主語為單數(shù)，be動(dòng)詞為was，invent的過去分詞為invented，因此為"was invented"．

點(diǎn)評(píng) 考生需先理解句意，再結(jié)合句法結(jié)構(gòu)，推測(cè)出所要填的詞語的正確形態(tài)．

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