1£®I started doing sth.two years ago and have been addicted to it.

2£®Until last year£¬I was trying to do...

3£®I fall in the bad habit of doing...three years ago.

4£®Unluckily I find I have been addicted to...

5£®I have been annoyed about the question that...

6£®I was anxious that I could not concentrate on...