Question

他過去學習不努力。當老師上課時，他假裝在認真聽講。(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．

表示過去習慣于做某事可用used to+動詞原形，否定形式可以寫成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間狀語從句，可以用when來引導，本題描述的是過去，要用過去時，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，聽課可以翻譯成listen to the teacher，修飾動詞聽應該用副詞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。