A. I  wearing a black shirt. 

=> Corrected punctuation.​

I wearing  a yellow pants. --> I'm wearing yellow pants.

I wearing a blue blouse. --> I'm wearing a blue blouse.

=> Corrected: The sentences are corrected grammatically.​

B. Are you okay? (Correct)

 Yes I'm okay. (Correct)​

Wow Look that! --> Wow, look at that!

=> Corrected: The sentence is corrected grammatically.​​