英语语法问题 英语语法问题？
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1. Doing morning exercises every day can maintain health.Doing morning exercises every day can keep healthy.这两个句子意思一样，可以互换。
keep是及物动词，可以在后面加形容词，来表示“保持一种状态不变”，keep (sth.) adj.maintain也是及物动词，它有一个意思是“使事物保持原有的状态或者标准”，maintain sth.
keep后面加动名词的时候可以表示“保持做一个动作，一直做一个动作”；这时，如果还想要用maintain，后面就不能用那个动名词了，因为maintain没有这个含义。
如：They keep writing to each other. = They maintain contact with each other.
所以，第二句in western culture, maintaining eye contact in conversations is necessary. 只可以换成in western culture, keeping eye-talking in conversations is necessary. (eye-talking是我编纂的一个词啦，意思是告诉你，这句话如果用keep，后面应该用动名词。)
所以，你会发现，有时，词语搭配是决定你选择用哪个词的关键。
回答楼主的问题， maintain [mein'tein] vt. 维持;维修,保养;坚持;断言 keep [ki:p] n. 生计,维持
v. 保持,保存,维持 首先，keep多用于保持某种状态，保持健康等maintain多用与，维持平衡，维持关系等， 放中文里，两者就是保持与维持的关系，这个是它们最主要的区别。而楼主给的例句都是用 keep，保持的意思。
maintain vt. 维持, 维修, 继续, 供养, 主张英英解释:动词maintain:
1. keep in a certain state, position, or activity; e.g., "keep clean"
同义词：keep, hold
2. keep in safety and protect from harm, decay, loss, or destruction
同义词：conserve, preserve, keep up
3. supply with necessities and support
同义词：sustain, keep
4. state categorically
同义词：assert, asseverate
5. have and exercise
同义词：wield, exert
6. maintain for use and service
同义词：keep
7. maintain by writing regular records
同义词：keep
8. state or assert
同义词：defend
9. support against an opponent
同义词：uphold
10. observe correctly or closely
同义词：observe, keep
keep 和 maintain 都是“保持”的意思 。不同的是 keep常作为不及物动词，后面常接形容词；而maintain常作为及物动词，后面常接名词。
首先这不是一个语法问题
这是一个用词问题
从英语意义的角度来说
如果不maintain的话 事物会有一点一点损耗或者退步
如果不keep的话 事物就直接没了
所以可以理解为
maintain是为了keep
要keep的话就需要maintain
从集合的角度来看
keep当中包含maintain
maintain是一种keep的方式
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