YOU SAID:

I'm going to have to have lunch with a lot of friends tomorrow

INTO JAPANESE

明日はたくさんの友達とランチを食べなければならない

BACK INTO ENGLISH

I have to eat lunch with many friends tomorrow.

INTO JAPANESE

明日はたくさんの友達とランチを食べなければなりません。

BACK INTO ENGLISH

I have to eat lunch with many friends tomorrow.