used to be的用法和搭配

　　London used to be Britain's largest port.

　　倫敦過去是英國最大的港口城市。

　　India used to be a dependency of Britain.

　　印度過去是英國的附屬地。

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

　　他過去一天能騎50英里，不過現在恐怕不行了。

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

　　瓊斯過去是小偷, 但是現已知過能改重新做人.

　　There used to be public executions.

　　處決囚犯過去都是公開執行的。