네요 is used to express surprise, thought or impression regarding something. You have to add it after the verb stem or the past tense suffix.
- 너 정말 예쁘네! / You are really pretty! (Note: 네 and 네요 are the same thing, but, by not adding 요 at the end, the speaker is less formal, as you may have already known)
- 이거 정말 맛있네요! / This is really tasty!
- 너 = you (informal)
- 정말 = really
- 예쁘다 = to be pretty
- 이거 = this, this thing
- 맛있다 = to be delicious
Consult this lesson from the Talk To Me In Korean website for more! I find this site really helpful and if you haven’t heard of it before you should definitely check it out. They also have a YouTube channel if you are interested in that!