Answer:
they seem to have forgotten everything
The plastic bag got dropped on the street by it’s owner.. It was windy that day, but the bag still wanted to have fun. So, he waited for the red light and walked across the street to the cafe, looked through the windows and saw everyone enjoying themselves. This made him happy, and he continued his walk down his local boulevard. As the day progressed, the wind got less strong and he was tired from walking all day, so leaned against a brick wall and rested.
Answer:
A semicolon is typically used to combine two or more parts of a sentence, like
"We ran out of gas on the way back home; all of the gas stations were closed because of holiday."
Or something like that.
So basically use it when you two short sentences that don't need to be separated. Rather, use a semicolon!