it's not easy to catch fish only with your hands.

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it''snoteasytocatchfishonlywithyourhands.it''snoteasytocatchfishonlywithyourhands.it''snoteasytocatchfi

it's not easy to catch fish only with your hands.
it's not easy to catch fish only with your hands.

it's not easy to catch fish only with your hands.
"it"在此处是作代词,代替后面的"to catch fish only with your hands",后面这个短语才是真正的主语.
一般因为"to do something"成分太长,放在前面会使句子有头重脚轻的感觉,读起来也不方便,所以久而久之,
it is adj.to do something差不多也就成了固定用法了.

it is +形容词+to do sth
做什么什么事 ...

it 是形式主语,真实主语是“catch fish only with your hands”这句话。正常语序是“Catch fish only with your hands is not easy”.