We must water these plants three times a week（改为被动语态）

We must water these plants three times a week（改为被动语态） We must water these young trees ofen.(改为被动语态) 1.We must water these young trees ofen,(改为被动语态). We must water the flowers everyday改为被动语态 将下列句子改为被动语态.We must water the flowers. People cut down a lot We must water the flowers every day.(改为被动语态） these plants will produce food and oxygen(改为被动语态). the trees must _____(water) three times a week at first. the trees must _______(water)three times a week at first. must i take the cold medicine three times a day?改为被动能去掉MUST吗 改为被动语态 They have read the book three times. we play basketball three times a week