it was hard for me to climb the mountain为什么用was,用is可以吗?用to climb the mountain作主语怎么写

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itwashardformetoclimbthemountain为什么用was,用is可以吗?用toclimbthemountain作主语怎么写itwashardformetoclimbthemoun

it was hard for me to climb the mountain为什么用was,用is可以吗?用to climb the mountain作主语怎么写
it was hard for me to climb the mountain为什么用was,用is可以吗?用to climb the mountain作主语怎么写

it was hard for me to climb the mountain为什么用was,用is可以吗?用to climb the mountain作主语怎么写
was就只是表过去,单独这句没有直接的时态限制,除非有上下文.
To climb the mountain was hard for me.这就是原本to do直接做主语的样子,主语太长了,头重脚轻,所以改成It做形式主语,把不定式挪到后面去,这也是“形式成分”存在的意义.