To conjugate the verb bailar, what should you do first? Drop the -ar from the infinitive, leaving the stem bail. Add the verb endings -o, -as, -a, -amos, -áis, or -an to the stem. Drop the -lar from the infinitive, leaving the stem bai. Add the verb endings -o, -as, -e, -emos, -áis, or -an to the stem.