Formal:
* நல்ல காலை (nalla kaalai): This is the most common and formal way to say "good morning." It literally translates to "good morning."
Informal:
* காலை வணக்கம் (kaalai vanakkam): This is a more informal way to say "good morning." It literally translates to "morning greetings."
You can also use சுகமா (sugama)? which means "How are you?" as a greeting in the morning.
So, depending on the situation, you can choose the appropriate greeting.