used to do sth.是被用来做某事还是过去常常做某事

问题描述:

used to do sth.是被用来做某事还是过去常常做某事

过去常做某事
He used to smoke every day.

used to do sth过去常常做某事

过去常常做某事
be used to do sth 是被用来做某事

是过去常常做某事

used to do sth 过去常做某事
be used to do 被用来做某事
be used to doing 习惯做某事