interesting前面加an。an用在读音以元音音素开头的单数可数名词或字母前。注意：这里说的是元音音素不是元音字母。a用在读音以辅音音素开头的单数可数名词或字母前。
interesting例句
1.He met a lot of interesting people during his life as a student.
他在学生时代接触过许多有趣的人。
2.That looks like an interesting book.
那好像是本有趣的书。
3.It would be interesting to know what he really believed.
了解他的真实信仰会是很有意思的。
4.She gave an interesting talk on her visit to China.
她做了个关于她在中国访问的有趣报告。
5.It is interesting to contrast the British legal system with the American one.
把英国的法制与美国的加以对比很有意思。