Example: she lend a book to me.
The second one, below, means directly below, and under is also possible
The third one, I just stand/sit at your downstairs
I just stand/sit at your downstairs
The fourth one, I just passed by from your home / house with you
I just came from your downstairs / house with you. I just stand/sit at your downstairs
Fourth, I just passed by your home / house with you
I just came from your home / house with you
Third, I just stood / sat at your downstairs.