This document summarizes stem-changing verbs in the present tense in French. It discusses -ER verbs with stem changes like acheter (to buy) and préférer (to prefer), verbs ending in -yer like payer (to pay), verbs with double consonants like appeler (to call), verbs ending in -cer like commencer (to start), and verbs ending in -ger like manger (to eat). It provides the conjugations for these verbs in the present tense.