1 . 画出下列句子中的动词不定式并判断它们在句子中的作用
1. They ran over to welcome us.
2. I’m sorry to hear that.
3. They are eager to take part in the work.
4. They’re working hard to fulfill the plan.
5. I rushed to the hospital, only to be told that the patient had left.
6. We’ve come to learn from you.
7. What have I said to make you so angry?
8. We are proud to be young people of China.
9. They jumped for joy to hear the news.
10. He went out to buy some medicine for his grandpa.