Question

他過(guò)去學(xué)習(xí)不努力。當(dāng)老師上課時(shí)，他假裝在認(rèn)真聽(tīng)講。(used to，when)
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Answer 1

He used not to work hard．When the teacher had class，he pretended to listen to the  teacher carefully．

表示過(guò)去習(xí)慣于做某事可用used to+動(dòng)詞原形，否定形式可以寫(xiě)成used not to do，所以本題的第一句可翻譯成He used not to work hard。本題的第二句含有時(shí)間狀語(yǔ)從句，可以用when來(lái)引導(dǎo)，本題描述的是過(guò)去，要用過(guò)去時(shí)，故老師上課可以翻譯成the teacher had class，假裝做某事可翻譯pretend to do，聽(tīng)課可以翻譯成listen to the teacher，修飾動(dòng)詞聽(tīng)?wèi)?yīng)該用副詞carefully，故本題的第二句可翻譯成When the teacher had class，he pretended to listen to the  teacher carefully。