A. What giant animals have you already seen?

I have seen an elephant.

Your sentence iscorrected grammatically.​

B. 1. You go to bathroom right now. Wash your face and brush your teeth. 

2. Yes I am wake up. 

3. Yalmi Hurry up. It's time to go to school.

Your sentences are corrected grammatically and these are the correct usage/ expressions.

​

1. Go to the bathroom. Wash your face and brush your teeth now.

2. Okay, I'm up.

3. Yalmi, hurry up! It's time for school.​