Pies czeka przy drzwiach, bo widzi smycz i wie, że zaraz pójdziemy na spacer.

The dog is waiting by the door, because it sees the leash and knows that we will go for a walk soon.

Breakdown of Pies czeka przy drzwiach, bo widzi smycz i wie, że zaraz pójdziemy na spacer.

• pies: the dog
• i: and
• drzwi: the door
• bo: because

Questions & Answers about Pies czeka przy drzwiach, bo widzi smycz i wie, że zaraz pójdziemy na spacer.

Why is it pies and not psa?

Because pies is the subject of the sentence, so it is in the nominative case.

• pies = dog, nominative singular
• psa = dog, accusative/genitive singular

Here the dog is the one doing the actions: czeka, widzi, wie. So pies is the correct form.

What form is czeka?

Czeka is the 3rd person singular present form of czekać, meaning to wait.

It matches pies because pies is singular:

• ja czekam = I wait
• ty czekasz = you wait
• on/ona/ono czeka = he/she/it waits

So Pies czeka means The dog is waiting or The dog waits, depending on context.

Why is it przy drzwiach?

Because the preposition przy requires the locative case.

• przy = by, next to, at
• drzwiach = locative plural of drzwi

So:

• drzwi = door / doors
• przy drzwiach = by the door

This is a very common Polish pattern: certain prepositions always force a certain case, and przy takes the locative.