题目内容：

帮忙英文词组区别下
帮我区别下.
过去常常
被用作
习惯于.
用used做词组.

优质解答

过去常常：Used to always do sthing in the past.
我过去常常很晚睡觉.
I used to always sleep late in the past.
- - - - -
被用作: Sthing were/was used as sthing.
照片被用作广告
The pictures were used as advertisement.
- - - - -
习惯于：I am used to doing sthing.
我习惯很快的完成作业.
I'm used to doing homework quickly.
不知道这是不是你想要的?