三個(gè)短語(yǔ)的意思如下：
used to do sth 過(guò)去常常做某事
be used to do sth 被用來(lái)做某事
be used to doing sth 習(xí)慣于做某事
相關(guān)練習(xí)題：
一、用所給單詞的適當(dāng)形式填空：
1.We used to ___ (go ）swimming last year.
2.I am used to ____（run）every morning.
3.Bamboos are used to ___(build) houses there.
4.They have been used to ______(live ) in the countryside.
二、根據(jù)漢語(yǔ)意思完成句子：
1.I _________________the food here.(我習(xí)慣于吃這兒的食物.)
2.Tom_____________here.(湯姆曾在這兒住過(guò).）
3.I ___________in the river when I was a child.(我小時(shí)候常常去河里游泳.）
4.Wood _____________paper.(木頭可以用來(lái)造紙.)
參考答案：
一、
1.go
2.running
3.build
4.living
二、
1.am used to eating
2.used to live
3.used swim
4.can be used to make