YOU SAID:
I forgot to buy groceries for tonight's dinner
INTO JAPANESE
今夜の夕食に食料品を買うの忘れちゃった
BACK INTO ENGLISH
I forgot to buy groceries for dinner tonight.
INTO JAPANESE
今夜の夕食に食料品を買うの忘れてしまいました。
BACK INTO ENGLISH
I forgot to buy groceries for dinner tonight.
Well done, yes, well done!