Our class,in fact, is just before lunch time, and I'm happy to say that when they do my class, they don't need lunch any more because they eat what they make."

VOA: standard.2010.05.14

I'm again happy that you asked questions because that's when you bring out a speaker really well.

同时我又很开心你们在当时提出了问题,因为这样才能很好的鼓励发言者。

耶鲁公开课 - 金融市场课程节选

I'm glad is a pattern that you want to use in a sentence to describe when you're feeling happy.

当你感觉高兴的时候，你可以用“I'm glad”句型来形容你的感受。

I'm glad 课堂 - SpeakingMax英语口语达人