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charity
Is it fantastic to work as a volunteer?
Is it important to support the Special Olympics World Games?
What does Liu Ming think?
It is + adj. + to do sth.
真正的主语
形式主语
表达对做某事的看法
整个结构用于表达：做某事是……
right
seats
the elderly
to
It is right to give seats to the elderly.
It is + adj. +to do sth.
good
blind people
cross the road
It is good to help blind people
cross the road.
It is + adj. +to do sth.
helpful
money
to charities
It is helpful to donate money to charities.
It is + adj. +to do sth.
It is + adj. +to do sth.
proper
a lost pet
It is proper to take care of a lost pet.