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19.Try to speak English as much as possible.(改为否定句)
Don't try to speak English as much as  possible.

分析 --尽量多说英语.
--不要尽可能多地说英语.

解答 答案:Don't try.考查否定句.原句是祈使句,通常以动词原形开头,否定形式在句首加don't.后跟动词原形try.答案是Don't try.

点评 考查祈使句.表示请求、命令等的句子叫祈使句.通常以动词原形开头,否定形式通常是在句首用don't,let's后+not等.要结合语境完成练习.

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