VERBing Alone with 一人で (hitori de) and Together with と一緒に (to issho ni)
と as “and” or “with” and 一人で as “by oneself”
As with the Noun と Noun form, と in this pattern similarly suggests a company between or amongst things. と commonly occurs with 一緒に, which means “together”. 一人で means a person is doing something by him or herself.
(Ashita, George to issho ni ice cream wo tabemasu.)
“Tomorrow, I am eating ice cream with George.”
(Ashita, hitori de Akihabara ni ikimasu.)
“Tomorrow, I am going to Akihabara by myself.”
“alone/by myself/one person”