What do you do when someone borrow your things and not to send back to you?

Since it was a "friend" the first thing i would do is face it - Call him/her, write - do whatever it is you would do to get in touch w/them and be stern. Hey listen, I loaned you that because I trusted you and you were my friend. I now need it for something important as soon as possible and I receive no communication from you to even let me know you needed it longer. If it is something where they would have to pay postage to get it back to you, tell them, you will pay for the postage, but you must get in touch w/them to set this up. While you're explaining this to him/her, if you're getting the vibe they still won't do it, tell them you will report it stolen and that you believe you know who took it and, if necessary, will report them as well. Be sure to say, its sad that a friendship is going to be ruined over this, but all you had to do was talk to me and let me know. I feel you are stealing from me and it is not right. I wish you all the best. I hate that too, I have been burned many a time, that is why I feel so strongly about it. Also, please learn in the future - its not worth it. Let your friend beg and beg - but tell them, -hey i dont have nice things often, and people have stolen from me. I am not lending anything to you. Good luck!

hi, the first thing i should do when someone dont return the things they have borrowed, i ask them first where's my things, and i will ask them politely if i can have that things because i need it sometimes to use my own reason. sometimes i feel a little bit of annoy and anger when they are really ignore me while asking them back my things.

This is a very simple question and it is very easy to answer... Ask him about it! I know sometimes we find it hard to ask other people about things that they borrow from us as we think we might hurt their feelings. However, I don't see anything wrong there as long as you ask him in a nice way. Hope you get it back soon.