doing sth is important为什么是DOING?arriving at the airport early is important.studying english is important为什么是doing arrive at the airport 不行吗

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doingsthisimportant为什么是DOING?arrivingattheairportearlyisimportant.studyingenglishisimportant为什么是doin

doing sth is important为什么是DOING?arriving at the airport early is important.studying english is important为什么是doing arrive at the airport 不行吗
doing sth is important为什么是DOING?
arriving at the airport early is important.
studying english is important
为什么是doing
arrive at the airport 不行吗

doing sth is important为什么是DOING?arriving at the airport early is important.studying english is important为什么是doing arrive at the airport 不行吗
is前面是主语啊,主语只能是从句或名词性短语.如果你看到动词做主语要么是倒装要么是省略了成分(感叹句)