We are going to have dinner .
我们准备去吃晚饭 (大歺 )。
be going to do sth . 打算 / 计划 做某事
一般将来时态的句子,可以用 will / shall do :
We shall go to have dinner .
汉语:我们将去吃晚饭 。
we will have dinner.
We are going to have dinner.我们打算吃晚饭。同义句是We will have dinner.