We haven't heard from David since he left Shanghai.[对划线部分提问] since he left Shanghai[画线]

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• 1、the oil from ships causes sea pollution 变为被动语态2、we speak chinese in china 变为被动语态3、the workers make many kinds of machines in that factory 变为被动语态4、rice is grown in south china变为主动语态5、a lot of waste is produced by people every day变为主动语态6、pollution is not cared about by them at all 变为主动语态对划线部分（括号里）提问i haven‘t seen her （since i left for china）用at 8 yesterday evening改写句子the twins are watching tv now变为i don’t know的宾语从句who is he waiting for?用both.and.合并成一个
• We haven't heard from David since he left Shanghai.[对划线部分提问] since he left Shanghai[画线]
• We have't heard from David since he left Shanghai.(对划线部分提问,划since he left Shanghai）
• We haven't heard from David since he left Shanghai.[对划线部分提问] since he left Shanghai[画线]
• We have't heard from David since he left Shanghai.(对划线部分提问,划since he left Shanghai）
• We haven't heard from David (since he left Shanghai).(对括号部分提问) ——— ———haven't you heard from David?
• We haven't heard from David (since he left Shanghai).(对括号部分提问) ——— ———haven't you hear
• I listened carefully but I heard nothing各个单词在句中起什么成份?
• We have't heard from David since he left Shanghai.(对划线部分提问,划since he left Shanghai）