Unfold is a verb that means to spread out from a folded position. Therefore it can be used in the following possible sentences:

• You have to unfold your serviette before using it.
• She opened the envelope, took a second to unfold the letter, then read it.
• I unfold my shirts the night before wearing them so they don't have a crease.

Enfold

Unfold

Refold

I can give you several sentences.

• It will be exciting to watch the action unfold on that TV show.
• You need to unfold the towels and refold them into a neater pile.
• The flower's petals will unfold once the sun hits it.