This morning I was going to the hospital, and then my mother called me and said that I need to visit my grandmother. Хорошо
When i finished my busy (<--- "busy" is the wrong word. Какое слово вы имеете в виду?) in the hospital ,i went to my grandmother and we ate and talked about life.
After 6 p.m i decided go to the store. Хорошо
And i <s>was going</s> went at 6:30 <s>18:30</s> (Американцы не используют 24-часовую систему для записи времени.Мы используем 12 и 12. A.M. и P.M.)
when I <s>came to</s> arrived at the store ,i bought candles.