I was surprised and became sad.
- Je fus surpris et devins triste.
I was slightly surprised.
- J'étais un peu surpris.
I was amazed at his courage.
- Son courage m'a surprise.
Sorry I startled you!
- Désolé de vous avoir surpris !
Tom was startled by a knock on the door.
- Tom a été surpris par un coup sur la porte.