it was hard to do与it was hard doing的区别

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itwashardtodo与itwasharddoing的区别itwashardtodo与itwasharddoing的区别itwashardtodo与itwasharddoing的区别itwasha

it was hard to do与it was hard doing的区别
it was hard to do与it was hard doing的区别

it was hard to do与it was hard doing的区别
it was hard to do
这个句式,是以it做形式主语,真实主语是后面to do(不定式)部分
至于第二种,我没见过,等高手解析一下