1.It was interesting to learn… it作形式主语
The surprising thing was to hear how many animals are in danger.（表语）
2.We need to protect them better“need to do sth.” .”需要做…”
(1)情态动词：后接动词原形
以must开头的一般疑问句的否定回答用mustn’t
(2)实义动词：后接动词不定式
3.Are you surprised to find out that whales are in danger?
surprise:n. 意为：惊奇、诧异。Eg: to one’s surprise
adj : surprising
surprised (区别)
4.It makes me sad.太让我气愤了！
(1)make sb do sth
