Breakdown of Du musst aufpassen, dass du nicht stolperst.
du
you (informal singular)
nicht
not
müssen
to have to, must
aufpassen
to pay attention
dass
that
stolpern
to stumble
Questions & Answers about Du musst aufpassen, dass du nicht stolperst.
The current lesson is about the dummy object 'es'. Could we say 'Du musst es aufpassen' here?
No. The verb aufpassen does not take a direct accusative object, so you can never use a dummy es with it. However, because aufpassen usually pairs with the preposition auf (auf etwas aufpassen), you could use the prepositional placeholder darauf to introduce the subordinate clause: Du musst darauf aufpassen, dass... In everyday speech, this darauf is frequently dropped, which is why there is no dummy word at all in this specific sentence.
The English translation uses the infinitive 'not to stumble'. Why does German use a 'dass' clause instead of a 'zu' infinitive?
While English heavily prefers an infinitive when the subject is the same in both parts of the sentence (You must be careful -> you do not stumble), German is much more flexible. You absolutely can use an infinitive clause here (Du musst aufpassen, nicht zu stolpern), but using a dass clause (dass du nicht stolperst) is extremely common and sounds perfectly natural in spoken German.
Since 'aufpassen' is a separable verb, why isn't the prefix 'auf' at the end of the sentence?
Because of the modal verb musst. Whenever a modal verb is the conjugated main verb in a clause, it pushes the secondary verb to the very end of that clause in its full, unseparated infinitive form. The verb aufpassen would only separate if it were the conjugated verb itself (for example: Pass auf, dass du nicht stolperst!).
Could I use 'vorsichtig sein' instead of 'aufpassen' to mean 'be careful'?
Yes, they are highly interchangeable in this context. Du musst vorsichtig sein is the direct translation of 'You must be careful'. However, aufpassen (literally 'to watch out' or 'to pay attention') is a very active, common way to warn someone about an immediate physical hazard, like tripping.
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