i will never forget dinner we had together和my mother usually has dinner at home 哪个错了

i will never forget the dinner we had together
my mother usually have dinner at home

i will never forget dinner we had together
改成：i will never forget the dinner we had together.
后句正确。

i will never forget【the】 dinner we had together
my mother usually has dinner at home此句没错

第一个 dinner前面加the