On this page you'll learn everything about verbs with nominative complements. Complements are really important to help you know whether you should use the nominative, accusative, dative, or genitive case. But first, you have to know what a complement is. If you aren't sure, take a look at this page on complements in the German language.
Verbs always require a noun in the nominative case
The verb can‘t function by itself and needs a subject → The subject is in the nominative case, so we call this a nominative complement.
The subject can be a person or a thing.
The verbs "sein," "werden," "bleiben," and "heißen" require a second nominative complement (in addition to the subject):
When these verbs are used without a preposition, the corresponding object is always in the nominative form.
If these are followed by measurements (weight, length, time, …), we need to use the accusative case! (The question is "how?" → No nominative case possible.)
„Der Schrank ist einen Meter hoch.“
But: „Der Schrank ist ein alter Schrank.“
„Er bleibt einen Monat im Krankenhaus.“
„Der Tisch ist einen Meter Achtzig lang.“
If we give a command (imperative) we don’t need a nominative complement because we speak to the subject (the subject is implied, just like in English):
When using the impersonal passive, there is sometimes no subject / nominative case (other times there is the impersonal pronoun "es").
In general, every verb needs a subject → Every verb has a nominative complement.
Only imperative and impersonal passive can be used without a nominative complement.
All the info you need for the various complements in German: