Please I need your help about connectors, prepositions, etc
I have a lot of problems with the prepositions, connectors, etc , for example when I'm writing, sometimes I don't know when I have to use "the, on, at, that , in,", for example in this sentence :
For monday I'll have a dinner with my wife or
On Monday I'll have a dinner for my wife
which one is right?? FOR OR ON?
also I abuse about using of "THAT" , so maybe someone could clarify me how to use them or how I can guide myself to get better
Thank you very much Sorry I wrote for instead with at this sentence : On Monday I'll have a dinner for my wife