1、used to do 過去常常(表示現(xiàn)在不再) used to do過去常常，過去曾經(jīng);過去常常做某事He used to do his homework on Sunday, but now he often does homework on Saturday.他過去在星期天做家庭作業(yè)，但是現(xiàn)在他經(jīng)常在星期六做作業(yè)。

2、eg: I used to swim in the lake near my village when I was young. be used to doing習(xí)慣于做某事 eg: My grandpa is used to going for a walk after dinner. be used to do 被用于。

3、 eg: Wood can be used to make paper"I used to do this rather regularly, particularly with shoplifters, " the judge said.“我以前經(jīng)常這么判決，特別是對那些商店扒手，”法官說。

4、有一點(diǎn)需要補(bǔ)充。

5、在選擇題中看到be used to時(shí)，應(yīng)當(dāng)首先根據(jù)句子判斷其所要的意思是什么，然后在決定選哪一個(gè).另外，當(dāng)習(xí)慣做某事時(shí)，由于to是介詞，所以要加動名詞doing;而be used to do sth.是使用的被動語態(tài)，所以后面加動詞原型.另外，如果強(qiáng)調(diào)漸漸適應(yīng)，還可以用get used to doing sth.