Theorie:
Study the information about the structure: adjective + to + infinitive.
1. Adjective + to + infinitive
Use this structure with the following adjectives: difficult, easy, hard, impossible, dangerous, safe, expensive, cheap, nice, good, interesting, exciting.
Do you think it is safe to drink this water?
![shutterstock_1892877370.jpg](http://resources.cdn.yaclass.at/4c43f3eb-61d4-4986-a241-011951b27343/shutterstock_1892877370-w300.jpg)
It is interesting to play with Jim.
2. It is nice of you to...
You can use many other adjectives: kind, sensible, sad, amazed, careless, unfair, considerate, silly.
![shutterstock_387564718.jpg](http://resources.cdn.yaclass.at/fbaf25d4-83f5-4c8d-b31e-93cb5cd8a478/shutterstock_387564718-w300.jpg)
3. I am sorry to/I was surprised to…
Use the structure adjective + to if you want to say how somebody reacts to something.
Other adjectives for this purpose: happy, sad, pleased, disappointed, surprised, amazed, astonished, relieved.
![shutterstock_1489765415.jpg](http://resources.cdn.yaclass.at/cf4c5665-c1ab-4d07-9f32-63e1e4631b87/shutterstock_1489765415-w300.jpg)
4. Use to after the first, the last, the next, the only, the second.
He is the first to orbit the Earth.
5. Something is sure/certain/likely/bound to happen.
Jim is a good student. He’s bound to pass this test.