I often go shopping with my mom.I am going to the shop with my mom at the moment. I have gone shopping with my mom already.I have been shopping with my mom since morning. I went shopping with my mom yesterday.I was shopping with my mom yesterday at 5 o'clock.I had already gone shopping with my mom.I had been shopping with my mom for 2 hours when you called.I will go shopping with my mom tomorrow. Tomorrow this time I will be shopping with my mom.I will have gone shopping with my mum by next month. Next year I and my mom will have been shopping together for 10 years. (В следующем году будет 10 лет как мы с мамой ходим за покупками вместе - нужно добавить слово "вместе", а то звучит коряво)