YOU SAID:
I have to go to the store to get milk
INTO JAPANESE
牛乳を買うために店に行かなければならない
BACK INTO ENGLISH
I have to go to the store to buy milk
INTO JAPANESE
私は牛乳を買うために店に行かなければなりません
BACK INTO ENGLISH
I have to go to the store to buy milk
Well done, yes, well done!