是賓語從句
有些形容詞具有動詞的含義,所以也可以帶一個賓語從句,例如；
I am sorry I am late.
I am glad that you can join us.
Are you sure his answer is right?
常用來引導(dǎo)賓語從句的形容詞有：sure,certain,glad,please,happy,sorry,afraid,satisfied,surprised
I am sure I will pass the exam.
我確信我會通過考試.
I am sorry that I have troubled you so long.
很抱歉我這么長時間在打擾你.
He is glad that Li Ming went to see him when he was ill.
他很高興在他生病的時候李明能去看望他.