What are the six modal verbs in German?

The six modal verbs are müssen (to have to), können (to be able to), wollen (to want (to)), sollen (to be supposed to), dürfen (to be allowed to), and mögen (to like).They behave differently to other verbs in German, because in the regular present tense, the first person singular form and the third person singular form are the same. They also have no endings.E.g.Ich muss = I have toEr muss = He has to