they ues the knife to cut apples 改为被动句

问题描述:

they ues the knife to cut apples 改为被动句
the knife ____ _____ to cut apples

is used原因be+过去分词构成被动语态。use的过去分词是used不明白再补充。we clean the classroom every day同上 the classroom ————every dayis cleaned还是这样的结构。