Glad to be on the “air” again.

很高兴在“空中”与大家见面。

形容词性不定式用法：to+原形动词放在名词后面时。

I have something to do.

我有些事要做。

被修饰的名词一定要做不定式里面动词的宾语，否则做介词的宾语。

She gave me something to remember her by.

她给我些东西让我记住她。

Please gave me a pen to write with.

请给我一支笔写些东西。

I will go to that place.

我会去那个地方。

不定式可以做副词。在动词的后面或在完整的句子后面放不定式短语为to+原形动词。

I sang to please her.

我唱歌让她高兴。