20．-Can I go to the concert with you tomorrow，Mum？
-Of course，if all your homeworkis done（do） by noon．

分析 --我明天可以和你一起去音樂(lè)會(huì)嗎，媽媽？
--當(dāng)然．如果你全部的作業(yè)都在中午之前完成了．

解答 答案：is done．考查被動(dòng)語(yǔ)態(tài)．句意"--我明天可以和你一起去音樂(lè)會(huì)嗎，媽媽？--當(dāng)然．如果你全部的作業(yè)都在中午之前完成了．"．homework是動(dòng)作的承受者，因此用被動(dòng)語(yǔ)態(tài)．be動(dòng)詞+動(dòng)詞的過(guò)去分詞．homework不可數(shù)名詞．在時(shí)間，條件，讓步狀語(yǔ)從句里，要用一般現(xiàn)在時(shí)表示將來(lái)，因此用be動(dòng)詞單數(shù)is．do的過(guò)去分詞是done．答案是is done．

點(diǎn)評(píng) 被動(dòng)語(yǔ)態(tài)表示主語(yǔ)是動(dòng)作的承受者，被動(dòng)語(yǔ)態(tài)由"be動(dòng)詞+及物動(dòng)詞的過(guò)去分詞"構(gòu)成，be動(dòng)詞的單復(fù)數(shù)要與主語(yǔ)的單復(fù)數(shù)保持一致，還要注意時(shí)態(tài)及過(guò)去分詞的變法．

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