Breakdown of Ich lege das Buch auf den Boden.
ich
I
das Buch
the book
auf
on / to (down/up to a level)
legen
to lay / to put (flat)
der Boden
the floor / the ground
Questions & Answers about Ich lege das Buch auf den Boden.
Why is it auf den Boden and not auf dem Boden?
auf is a two-way preposition. Because you are actively placing the book onto the floor, the action shows movement towards a destination (answering "where to?" or wohin?). Therefore, the masculine noun der Boden must take the accusative case, becoming den Boden. If the book were already resting there with no movement, you would use the dative case (auf dem Boden).
I always mix up legen and liegen. Why do we use lege here?
legen means "to lay" or "to put", which is an active movement. It takes a direct object (das Buch) and an accusative destination (auf den Boden). On the other hand, liegen means "to lie" or "to be located" (a stationary position). If the action were already finished, you would use the dative case: Das Buch liegt auf dem Boden (The book is lying on the floor).
Is das Buch in the nominative or accusative case here?
It is in the accusative case because it is the direct object of the sentence (the thing you are putting). Because Buch is a neuter noun, its accusative word for "the" (das) looks exactly the same as its nominative form.
Could I use the preposition an instead of auf for "on the floor"?
No, auf is specifically used for placing something on top of a horizontal surface, like a floor or a table. The preposition an is used when placing something on or against a vertical surface, like hanging a picture on a wall (an die Wand).
Learn Ich lege das Buch auf den Boden and more in German
All course content and exercises are completely free — no paywalls, no trial periods, no signup needed.
- ✓ Practice with interactive exercises
- ✓ Track your progress with spaced repetition
- ✓Learn at your own pace — completely free