1. Is correct. 2. The sentence is awkward but not necessarily incorrect. A native English speaker would not express these ideas like this. English speakers usually express the main idea of their sentence first and then add on qualifying details - finding the main idea is the tricky part! For example: "I have known since day one that I can't trust you or your friend." However, for me, as an English speaker, this still sounds awkward. I would suggest changing: "I can't trust you or your friend," to: "either of you." So: "I have known since day one I can't trust either of you." 3.This sentence is unclear, I think because you have treated an idiom literally, as if making your day would be the same as constructing a house - "Make your house with bricks." In English you might say: "Try to make your day by exercising," but this still sounds awkward so: "A session of enjoyable exercise will make your day!" might be a suitable alternative. Or, drop the idiom: "Make your day," and say: "Exercise will improve your day." 4.Is correct. 5. Is correct but use an exclamation mark if writing it down to show emphasis/ feeling. Hope this helps.

1- I have come here to pay off my debt - It is correct, but I would say pay off a debt is quite a long term thing and it might not be something you would go to a place to do. But, the sentence is good. 2- From day one I have Known I can't trust you and your friend - This is correct, I would put from day one at the end of the sentence though. 3-try to make your day with exercising - I would generally say with. But, it is a slightly strange exercising. 4- I'm used to staying up late most of the time - This one is fine for me 5- I never thought Paris was so beautiful - I would maybe say I never knew Paris was so beautiful