rather than 用在哪里?可以用It's rather than.句首句中都可以吗

常用句式:prefer to do...rather than(to)do...
可以用:It's rather...than...两处...在语法上为相同成分.

不可以用it's rather than...
句首句中都可以,但是必须有两件事.I'd prefer to do A rather than doing B.
Rather than going to a movie, they decided to watch a game.