标签:
导读 used to do sth :过去常常做某事be used to do sth :被用来做某事be used to doing sth :习惯做某事use for use as us...
used to do sth :过去常常做某事be used to do sth :被用来做某事be used to doing sth :习惯做某事use for use as use to不可以单独用,常用于被动语态中。
分别表示被用来做某事(接v-ing)、被作为……用来、被用来做某事(接不定式)。