I thought I'd never be rid of that cold. [=I thought that cold would never go away]我觉得我那场感冒会永远治不好。

He thought he'd never be rid of her.他以为永远摆脱不了她。

It's just as well that he left you. You're well rid of him. [=you're better off without him]他离开你也好。没他你会过得更好。