Hello There is a difference between those two words. 천만에요 means 'You are welcome' after someone says thank you. Actually Korean people don't use this commonly. They are more likely to say 괜찮아요 but 환영합니다 is used when greeting customers or someone into your house (Welcome in my house/ Welcome. Table for two?) I am going = 가요 (Literally 'I go') I am on my way = 가는중이에요 I will be going = 갈거에요/ 갈게요 I want to go = 갈래요 I went to = 갔어요 I will not be going = 안 갈거에요/ 안갈게요 (possibly could say 안 갈래요=I dont want to go) I did not go = 안갔어요 I am going 가고있어요 I am planning to go = 가려고요 I cannot go = 못 가요 Hope this helps^^