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）

These plants must be planted three times a week by us.

祝你学习进步，更上一层楼！(*^__^*)
有不会的可以再问我:）

The plants must be watered three times a week.

你好！ these plants should be watered plants three times a week 仅代表个人观点，不喜勿喷，谢谢。