used to be的用法和搭配

London used to be Britain's largest port.

伦敦过去是英国最大的港口城市。

India used to be a dependency of Britain.

印度过去是英国的.附属地。

He used to be able to cycle50 miles in a day, but he's past it now, I'm afraid.

他过去一天能骑50英里，不过现在恐怕不行了。

Jones used to be a thief, but now he's seen the error of his ways and is trying to rebuild his life.

琼斯过去是小偷, 但是现已知过能改重新做人.

There used to be public executions.

处决囚犯过去都是公开执行的。