被动语态,不用by
被动语态,不用by
change these sentences into passive voice.but DON'T use by.
1.People must return library books within three weeks.
library books must be returned within three weeks.2.You should keep all medicine in a locked cupboard.3.Customers cannot exchange goods without a receipt.4.Patients should not take these pills more than twice a day.5.They may hoist the typhoon signal NO.8 later today.6.We will not allow children wearing school uniforms into Internet cafe.7.Can people use this shampoo every day?all medicine should be kept in a locked cupboardgoods cannot be exchanged without a receipt these pills should not be takenmore than twice a day. the typhoon signal NO.8 may be hoistedlater todaychildren will not be allowed to wearschool uniforms into Internet cafecan this shampoo be used every day?要休息啦，有问题，再重新发问吧，有别的哥哥姐姐帮你解答啦