例句：

　　I used to do weight training years ago.

　　我多年前曾進(jìn)行過(guò)舉重訓練。

　　On a Thursday she used to do all the baking.

　　她以前每個(gè)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(guò)去都要在北愛(ài)爾蘭服役六個(gè)月。