Happy后接不定式的句子不少。譬如：
Happy to meet you. 见到你非常高兴。
We’re happy to be here. 大家在这里非常快活。
Ann will be happy to help you. 安帮你，会感到开心的。
He was happy to be among friends again. 他非常高兴又回到朋友们中来了。
这类句子的happy后是接不定式的，但在下面的句子中，happy接的是目前分词：
We were very happy to hear of his success. 闻知他的成功，大家特别高兴。
请问：happy后面可以接目前分词吗？若真是如此，它与接不定式有什么不同？谢谢！
▲be happy + to do sth.
I am very happy to receive your kind invitation. 我失分开心遭到你的盛情邀请。
注意：很多形容词、副词、过去分词作表语时，后面带有不定式作状语，表示产生这种情绪是什么原因等。容易见到的这种词有：able, angry, anxious, afraid, clever, determined, eager, fit, foolish, cruel, glad, lucky, sorry, pleased, ready, willing, happy, shocked, fortunate, surprised, disappointed, free, sure, pround, careful, delighted等。再例：
You are sure to succeed.
I am glad to meet you again.
He jumped with joy to learn his son had passed the exam.
Everybody should always be ready to help others.
Be careful not to catch cold.
▲be happy + -v.ing / v.-ed
She was happy sitting among her students. 坐在学生中间非常高兴。
Im very happy married to you. 跟你结婚我非常幸福。
The boy was very happy given a present. 由于得到了礼物，这歌男生特别高兴。
