■ got

1) 必须。

• We've all got to get up early tomorrow.我们大家明天都要早起。

2) 一定是。

• You've got to be kidding.你一定是在开玩笑吧。
• It's got to be Cindy!一定是辛迪！
• It's got to be there!它一定是在那边！

参见 have³条。