【探究总结】
(1)句型“It’s+adj. +to do sth.”，其中it作形式主语,真正的主语是后面的动词不定式。
(2)注意句型It's+adj. +for/of+sb. to do sth。中介词for和of的不同。若形容词是与人的品质、性格等相关的词，如clever,foolish, kind等用of。若形容词是描述事物的性质、特征,如important,dangerous,difficult等,则用for。

Homework
Are you looking forward to the summerholiday?
What are you going to do for the summer?Write down and share with your classmates.