The best way_to keep_healthy is to exercise every day.后面exercise 可以用动名词吗,doing 形式还是一定要to do 请说明原因确定吗请说明理由

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The best way_to keep_healthy is to exercise every day.
后面exercise 可以用动名词吗,doing 形式
还是一定要to do
请说明原因
确定吗
请说明理由

后面exercise 可以用动名词吗,doing 形式----不可以
还是一定要to do ---是的
请说明原因
确定吗 确定
请说明理由---和way"(干什么事的)方法“相关的非谓语动词,一般用动词不定式

The best way to keep healthy is to exercise every day.=The best way to keep healthy is exercising every day.
动词不定式或动名词都可做作句子的表语,所以to exercise 可以换成动名词exercising