Special features of the modal verbs

 

Modal verbs dürfen, können, mögen, müssen, sollen and wollen govern the infinitive of a full verb and can have no additional complements (e.g. an object). The infinitive that is connected to a modal verb is not preceded by the word zu.

 

Examples complement case governed by the full verb
Ich kann dir nicht helfen. dir = dative object helfen + dative
Peter will seine Oma besuchen. seine Oma = accusative object besuchen + accusative

 

Modal verbs can be combined with other modal verbs.

 

Example
Du musst Deutsch können.