YOU SAID:
i have to leave to go get dinner now
INTO JAPANESE
私は今夕食を取りに行く必要があります
BACK INTO ENGLISH
I need to go get dinner now
INTO JAPANESE
今すぐ夕食を食べに行かなければならない
BACK INTO ENGLISH
I have to go to dinner now
INTO JAPANESE
私は今夕食に行かなければなりません
BACK INTO ENGLISH
I have to go to dinner now
Come on, you can do better than that.