首字母i的形容词有：

interesting 有趣的；

irregular 不规则的；

important 重要的；

idle 懒惰的；

ideal 理想的

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。

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。

It is important to develop good study skills.

培养良好的学习方法很重要。

These statistics are important from an ecological point of view.

就生态学而言，这些统计数字很重要。