we began to plant trees at nine 改为否定句mr chen gets up at half past six every day .就划线部分提问------------ ------- ------- mr chen gets up every day .

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we began to plant trees at nine 改为否定句
mr chen gets up at half past six every day .就划线部分提问
------------ ------- ------- mr chen gets up every day .

we didn‘t begin to plant trees at nine

we didn‘t begin to plant trees at nine .(因为用的是过去式,助动词要用did not)