(1) used to do sth. 表示“过去常做某事”,但现在不做了,to是不定式符号,只有过去时态。如:[文章版权 禁止转载:考试与评价 O/@WDG8
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You used to talk in class, didn't you? 你过去一向在课堂上讲小话,是不是?[文章版权 禁止转载:考试与评价 2}iqOM"o]3crORR0FroG]
(2) be used to doing sth. 表示“习惯于做某事”,to是介词,有多种时态。如:[文章版权 禁止转载:考试与评价 d/Q=|PS%,i0Je.�rFroG]
I'm used to getting up early. 我习惯于起早床。[文章版权 禁止转载:考试与评价 dcXlW_C'&E{~~{BFroG]
(3) be used to do sth. 表示“被用于做某事”,是被动语态,to是不定式符号。如:[文章版权 禁止转载:考试与评价 JQ,"(x{R3/Y=n%?jFroG]
Wood is used to make paper. 木材是用来造纸的。[文章版权 禁止转载:考试与评价 W:+CAp?!bMaQ:LG}FroG]