英語学習： When NOT to use 'to' in English - Grammar

I'm going home.
Are you going home?
I'm going abroad.
I'm going underground.
I'm going downtown.
I'm going uptown.
I'm going there.
I'm going here.
I'm going anywhere.
I'm going inside.
I'm going outside.
I'm going out.
I'm going downstairs.
I'm going upstairs.


I'm going to school.
I'm going to work.