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Subject（主语）
It is necessary for us to protect our environment.
It is + adj. + of/for sb. to do…
when to use ‘of’
when to use ‘for’
形式主语
It is + adj. + of sb. to do…
= Sb. is + adj. + to do…
good, kind, nice, rude, clever, right, silly, thoughtful, brave, selfish…
It is + adj. + for sb. to do…
easy, hard, difficult, important, possible, necessary…
= For sb. , it is + adj. + to do…
Subject
It's tiring for Hobo to climb the steps. (9B P.6)
It's brave of him to go to a place that was unknown to humans at that time. (9B P.30)
It's rude to push in before others. (8B P.66)
It's necessary for these volunteers to
receive training before doing the task.
(8B P.80)
Object
（宾语）
think/ find / consider…+ it
+ adj. + to do
All of you think it funny to cheat TY.
形式宾语
宾语
I feel it comfortable to live with a robot. (9B P.42)
Verb. + to do… (only)
Verb. + to do/doing… (the same meaning)
Verb. + to do/doing… (different meanings)