介绍朋友的爱好时，可以用以下5句话：

1. My friend is very passionate about playing basketball.
   他非常喜欢打篮球。

2. She spends most of her free time practicing and watching games.
   她的大部分空闲时间都花在练习和观看比赛上。

3. She is also interested in playing the piano, which she practices every weekend.
   她还对弹钢琴感兴趣，每个周末都会练习。

4. Her dedication to her hobbies is inspiring.
   她对爱好的投入非常鼓舞人心。

5. We often talk about her latest achievements in sports and music.
   我们经常谈论她在体育和音乐方面最新的成就。