WOW, you're learning a lot of languages! Examines language list thing A 1280 DAY STREAK?! I DID NOT KNOW THAT WAS POSSIBLE! Keep it up!
comparing WHAT? There shouldn't be a period at the end, because it's not a sentence! (in English anyway)
Depends on question asked. What are you doing (as your friend is juggling apples in the store)? " I am comparing."
Songve, then your friend is comparing APPLES. There has to be a subsequent; in your example it is implied BECAUSE YOU SUPPLIED THE PRECEDENT.