Ecce 36: Review -- Conjugating the Future Tense Remember BO BI BU for 1 and 2, A and E for 4 and 3. That is, 1st and 2nd conjugation verbs use bo, bi, bu, BUT verbs from 3rd and 4th conjugation use -am, -es, etc. Tools Activity created by: Ginny Lindzey This activity was created by a Quia Web subscriber. To learn how to make your own, just like this, click here.