1.   Their friendship started after they met at a conference.

2.   Just like romantic relationships, many opposite-sex friendships may start when opposites attract.

3.   Several months ago, their perfect friendship started to change.

4.   The friendship started when they and their wives ran into each other at a suburban Washington mall and had a long, friendly chat.

5.   The friendship started with a crash.

6.   Their friendship started via mail and was formed quickly.

7.   Their friendship started in fifth grade.