Compare these two: Explain the acceptable English sentence relating to focal or tacit knowledge. 1. They went for Dinner. 2. They gone for dinner.
The past tense is usually used to describe a specific time in the past:
They went for dinner around 5 o'clock this evening.
The children went outside to play an hour ago.
The present perfect is used to describe something that has occurred in the past, but whose time is unknown or unimportant:
They have already gone for dinner.
The children have gone out to play (at some unknown / unimportant time) and won't be back till 3 o'clock this afternoon.