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.