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