it's difficult to后面接动词原型，比如说
It's difficult to learn maths.
it's difficult for后面接的是sb做了什么，比如说
It's difficult for me to learn maths.
to 后面接动词do 例如 it's difficult to finish it .
for后面接人称me her him it 例如 it's difficult for him.
也可以一起用 例如 it's difficult for him to finish it .
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