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It is meaningful to donate money to the Red Cross .
It is polite to queue for your turn.
It is necessary for us to take part in some activities.
It is + adj.+ to-infinitive
It is + adj.+ for sb.+ to-infinitive
形容词：描述人或事物的特征和性质。
不定式：to+动原
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 give help keep
plant take care of
It is right to give seats to the elderly.
It is good to help blind people cross the road.
It is helpful to donate money to charities.
It is proper to take care of a lost pet.
It is important to plant more trees.
It is necessary to keep parks clean.