過去常常做某事：used to do sth 習(xí)慣于做某事：be used to doing sth拓展資料：used to do sth 的用法：

1、Used to encourage sb to do sth he is hesitating to do 用以在某人遲疑時(shí)鼓勵他去做某事。

2、( also come along) used in the imperative to encourage sb to do sth( esp to hurry, try harder or make an effort) 用于祈使句以鼓勵某人做某事，（尤指促其加速、努力或試一試）。例句：1、I used to live in London.我過去一直住在倫敦。2、Life here is much easier than it used to be.如今在此地生活比起從前可舒服多了。

3、I used to go fishing by the river我過去常常去河邊釣魚。

4、I'm used to having a cup of tea in the morning.我習(xí)慣每天早上和杯咖啡。參考資料：英語語法網(wǎng)。