【正文】
assroom must be cleaned after school.(對畫線部分提問 ) the classroom ? must wash our hands before meals.(改為被動(dòng)語態(tài) ) Our hands before meals. can’t be be cleaned Can be taken When must be cleaned must be washed( ) stopped ,but there was not any sound. listen ( )2.— I don’t think sixteen yearolds to drive. — I aren’t serious enough at that age.