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Getting up is difficult.
It is difficult to get up early.

Playing the clarinet is not easy.
It is not easy to play the clarinet.

Whether he would come wasn't certain.
It wasn't certain whether he would come.

That he behaved like that was strange.
It was strange that he behaved like that.

It's impossible for me to lift such a heavy box.

It was kind of him to feed my dog for me.
It was inconsiderate of her to talk to him like that.