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會嗎，媽媽？
--當然．如果你全部的作業(yè)都在中午之前完成了．

解答 答案：is done．考查被動語態(tài)．句意"--我明天可以和你一起去音樂會嗎，媽媽？--當然．如果你全部的作業(yè)都在中午之前完成了．"．homework是動作的承受者，因此用被動語態(tài)．be動詞+動詞的過去分詞．homework不可數(shù)名詞．在時間，條件，讓步狀語從句里，要用一般現(xiàn)在時表示將來，因此用be動詞單數(shù)is．do的過去分詞是done．答案是is done．

點評 被動語態(tài)表示主語是動作的承受者，被動語態(tài)由"be動詞+及物動詞的過去分詞"構成，be動詞的單復數(shù)要與主語的單復數(shù)保持一致，還要注意時態(tài)及過去分詞的變法．

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