不得了, 着火了。

Oh no, it's caught fire!

他的情况简直不得了。

His situation is simply terrible.

这没有什么不得了。

There's nothing shocking about this.

痛得不得了

excruciatingly painful

忙得不得了

extremely busy

累得不得了

exceedingly tired

气得不得了

extremely angry

讨厌得不得了

hate virulently

亲热得不得了

extremely warm-hearted