例句：

　　I used to do weight training years ago.

　　我多年前曾進(jìn)行過舉重訓(xùn)練。

　　On a Thursday she used to do all the baking.

　　她以前每個星期四做所有烘烤的活兒。

　　The soldiers all used to do a six-month tour of duty in Northern Ireland.

　　士兵過去都要在北愛爾蘭服役六個月。