**Certainly** is an adverb that expresses agreement, confirmation, or assurance. Here are some examples of its usage:
1. I will **certainly** attend the meeting tomorrow.
2. She **certainly** knows how to cook delicious food.
3. It will **certainly** be a challenging project, but we can accomplish it with teamwork.
4. He **certainly** didn't expect to receive such a generous gift.
5. I **certainly** understand your concerns, and we will find a solution to this problem.
6. They **certainly** enjoyed their vacation at the beach.
7. **Certainly**, you can borrow my car if you need it.
8. We **certainly** appreciate your help with this project.
9. **Certainly**, I will be there on time for the appointment.
10. It is **certainly** a beautiful place to visit.