英语语法分析

He musta been a bird lover.

他一定是个爱鸟的人。

You musta been a railroad man on that railroad.

你肯定曾经在铁道公司当过铁路工人。

I'm sorry I didn't see you at the show, I musta missed you.

非常遗憾没能在演出时碰见你，一定是错过你了。