I've never run a marathon because I don't have enough opportunities and time to come, but I have no idea how to run a marathon is fun because I get to know new friends and found a lot of friends.
I've never run a marathon because I had no chance and enough time to come, but I had no idea that a marathon is a lot of fun because I have made new friends and met many friends.
I've never run a marathon because I didn't have a chance to time and source enough but I have the idea that ran the marathon was fun because I have friends and meet with a lot of friends.