写一篇My best friend作文,要多用used to句型

My best friend
I used to have many best friends.I used to think that they were my best friends because I used to consider friends as people who can play and have fun together.
As I grew older and older,I slowly changed my view on friends.I had a deskmate called Jack.We used to study together.But Jack was no fun.I didn't like to play with him.I didn't think of him as my best friend.One day,however,when I got caught in a fire,it was Jack who risked his life to save mine.
I understand now that what I used to believe is not true.A friend in need is a friend indeed.
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