YOU SAID:

How often must I cut the grass?

INTO JAPANESE

どのくらいの頻度で草を刈らなければなりませんか?

BACK INTO ENGLISH

How often do I have to cut grass?

INTO JAPANESE

どのくらいの頻度で草を刈らなければならないのですか?

BACK INTO ENGLISH

How often do I have to cut grass?