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I used to travel by air a great deal when I was a boy. My parents used to live in South America and I used to fly there from Europe in the holidays.
used to do 过去常常做某事
夏天我们常常去湖里划船。
We used to go boating on the lake in summer.
by air:坐飞机（旅行）
类似的表达:
We went there by car/by bus/by train/by bicycle
a great deal 许多，大量
我向你学到了许多东西。
I have learned a great deal from you.
used to do & would
都可用来表示过去经常性或习惯性的动作，常常可以换用。
eg. When we were boys we used to/would go swimming every summer.
used to & would 的区别:
used to表示过去经常性或习惯性的动作或状态现在已经结束。 People used to believe that the earth was flat．
would则表示有可能再发生。
He would go to the park as soon as he had time.
A flight attendant would take charge of me and I never had an unpleasant experience.
take charge of = be in charge of 照管，负责
老师让John在她不在的几个小时里照管班级。
The teacher asked John to take charge of the class for a few hours while she was away.
我来负责这件事。
I will be in charge of this matter.
= I am responsible for this matter.
