To teach is to lern.和To eat is to live.什么情况to放在句首

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To teach is to lern.和To eat is to live.什么情况to放在句首
To teach is to lern.和To eat is to live.什么情况to放在句首

To teach is to lern.和To eat is to live.什么情况to放在句首
动词不能做主语,所以这时要加动词不定式TO,这是语法问题.

一般来讲,to+ v. 表主动,表将来,表一次性动作,也就是偶尔的动作
放在句首做主语