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It is + adj. + to do
意思是:做某事是……的
It是形式主语，真正的主语是后面的不定式。
It is easy to play basketball.
It’s + adj.+ to do sth.
sad, necessary,
important, wrong,
possible, hard,
difficult, easy, good,
impolite…
描述对某一事情的看法或感觉怎样的形容词
It is polite to give seats to the elderly on
the bus.
It is fantastic to do voluntary（志愿的） work.
A It is + adjective + to-infinitive…
We can use “It is + adjective + to-infinitive” to express what we think about something.
It is
adjective
to-infinitive
It is
fantastic
to work as a volunteer.
important
to support the Special Olympics World Games.
Ways to help
Amy is thinking about what she can do to
help society. Help her use the words in
brackets and those in the box to make
sentences.
Donate捐献 give help keep