Ia this sentence in present tense? And correct, If not help me please

Explanation:
Hi, I'm French and don't speak English at all but I'll try to help you if I understand you want to know if your sentence is correct. So yes and no you have an error on. You have to mark "je porte pantalon court " you have to put "un" in front of pants its gives "Je porte un pantalon court ". Brandenburg Gate" Its what?
I did all I could to help you. tell me if you have any questions