If saying hello to only one person, then use salve. Otherwise, use salvete. Quid agis means “How are you?” You can respond in a variety of ways, from optime to male with more average answers in-between, such as bene and satis bene. Another thing you can say to your Latin-speaking friends is Quaenam est tempestas hodie? which means “How is the weather today?” To respond, you can say something like sol lucet, which means “the sun is shining” or nimbi in caelo sunt if it’s a cloudier day. If there’s precipitation, you might respond with ningit for snow or pluit for rain. Depending on the temperature, you may also say calet — it is hot — or friget — it is cold. When you’ve gotten sick of talking, just say vale to a singular person and valete to multiple people.