UGH!!! THIS IS SO HARD!!!! PLS HELP ASAP!!!!! 10PTS!!! BRAINLIEST IF UR ANSWERS R RIGHT!!!!

The o of some ar and er infinitives change to ue in the __1__ tense, in singular persons, __2__, __3__, __4__, and plural person __5__, and the commands Ud. and Uds.

The e in the stem of some ar and er infinitives changes to ___ in the present tense, in singular persons __6__, __7__, __8__, and plural person __9__, and the commands Ud. and Uds.