I often hear these mistakes made by German speakers who are learning English.
They say: We meet us tomorrow at 9.
There are a couple of things wrong with this.
Firstly, when we are talking about personal plans in the future (e.g. tomorrow) we use the verb +_ing.
Secondly, we cannot meet ‘us’. The verb meet is not reflexive in English.
So, the correct sentence is:
We are meeting tomorrow at 9.
Have fun learning English!
Louise