BD Chapitre 5: aller / venir / venir de + INFINITIF

Differentiate between the following sentences.
Je vais dîner. --> I'm going to sing.
Je viens dîner. -->I'm coming to have dinner.
Je viens de dîner. --> I just ate.
Je dîne. --> I'm dining / having dinner. /I dine / I have dinner.