I am happy whenever I play with my friend.

* * * CORRECTIONS * * *

     Tom: I am happy when i play with friend.
Correct: I am happy whenever I play with my friend.

* * * NOTE * * *

Hi Tom,
Good job for submitting your homework earlier!
Look at the correction, we use whenever for repeated events, so you are happy everytime you play with your friend. Also, I should always be capitalized.

See you in class, Tom!
T. Melody~