Hello English gurus,
I need your help to see which sentence is right/wrong...
A. "You
keep logging in, but didn't reply any of my messages"
B. "You
kept logging in, but didn't reply any of my messages"
C. "I
notice you
keep logging in, but didn't reply any of my messages"
D. "I
noticed you
keep logging in, but didn't reply any of my messages"
E. "I
notice you
kept logging in, but didn't reply any of my messages"
F. "I
noticed you
kept logging in, but didn't reply any of my messages"
Also...
G. "any of my stuff" or "any of my stuffs"
H. "any of my messages" or "any of my message"
I. "any of my activities" or "any of my activity"
I'm sorry if I asked too much. Please help. I'm so confused.

Thank you!