The key won't turn to start car .

What is your question?

When l put key in ignition l can't get it to turn except every now and then. When key will turn you have to turn to start position, turn it back to off then back to start then it will start. What is wrong with what I'm doing or is it the ignition and what can l do? What seems to make the problem better or worse? I just bought the car and privious owner is kind of usef to it. How long have you had this problem? He says about 2 years