YOU SAID:
they are going to go eat lunch
INTO JAPANESE
彼らは昼食を食べに行くつもりです
BACK INTO ENGLISH
They are going to eat lunch
INTO JAPANESE
彼らは昼食を食べるつもりです
BACK INTO ENGLISH
They are going to have lunch
INTO JAPANESE
彼らは昼食をとるつもりです
BACK INTO ENGLISH
They are going to have lunch
That didn't even make that much sense in English.
