In English, verbs take no endings except for the third person singular in the present tense, but German has more endings for verbs in the present tense than English.
Verb formation in the present tense
The formation of the verb in the present tense is easys: You take the stem of a verb and then add the required ending. The stem is the form of the infinitive without -en or -n.
The german word „kommen“ (English: to come). The stem is the form of the infinitive without -en or -n, so the stem of „kommen“ is „komm“.
Most verbs in German follow this regular pattern where the ending is simply added to the stem of the verb. But there are some German verbs where the stem ends in -d or -t or ends in a consonant + n or m and verbs with stem endings in -s, -ss, -ß, -x, -z, -tz (they have a different pattern). There are also irregular verbs with vowel changes.