A. I am after school go academy --> I went to academy after school.

  I am after math sleep. --> I slept after math.​

   I am after English homework. --> I did my homework after English class.

​

=> Corrected: The sentences are corrected grammatically. 

B.Hello. --> Bye!​

  What can I do for you? (Correct)​

  I buy the flowers ten. --> I want ten flowers.

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