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5．I think you should finish your homework first．（改為否定句）
Idon'tthinkyou should finish your homework first．

分析 --我認為你應該先完成作業．
--我認為你不應該先完成作業．

解答答案：don't think．考查否定句．主句含有think，且是第一人稱的賓語從句．從句的否定形式通常要轉移到主句上．一般現在時態，含義實義動詞，主語是第一人稱，變否定句在think前加don't．答案是don't think．

點評考查否定句．通常是在be動詞，情態動詞后加not．一般現在時態，主語不是第三人稱單數用don't，主語是第三人稱單數用doesn't．一般過去時態用didn't．還有其它用法需要牢記．

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