为啥动词放在句首要变现在进行时如:Traveling by airplane is the fastway to travel a long distance.

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为啥动词放在句首要变现在进行时如:Traveling by airplane is the fastway to travel a long distance.
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为啥动词放在句首要变现在进行时如:Traveling by airplane is the fastway to travel a long distance.
为啥动词放在句首要变现在进行时
如:Traveling by airplane is the fastway to travel a long distance.

为啥动词放在句首要变现在进行时如:Traveling by airplane is the fastway to travel a long distance.
Traveling by airplane is the fastest way to travel a long distance.
乘坐飞机旅行是长途旅行最快的方式.
这里的traveling并不是进行时,而是动名词,就是动词原形加上ing之后变成的名词形式.因为它是在句中充当主语的,而动词原形没有这种用法,但变成动名词之后就可以作主语了.

你好~
这不是现在进行时,仍是一般现在时。原句想要让动词作主语,就是让travel by airplane做主语,但动词原形不能做主语,所以动词要变为动名词,就是ing形式。
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