Wiem, że to kosztuje siedemset złotych.

Breakdown of Wiem, że to kosztuje siedemset złotych.

to
this
wiedzieć
to know
kosztować
to cost
że
that
złoty
zloty
siedemset
seven hundred

Questions & Answers about Wiem, że to kosztuje siedemset złotych.

How do we build words like siedemset for hundreds?
For numbers 500 to 900, Polish combines the base number with -set (a form of hundred). So, siedem (seven) plus -set equals siedemset. You do not use the separate word sto (hundred) for these higher numbers.
Why is the currency written as złotych instead of złoty or złote?
In Polish, quantities of five or more (including 500, 700, and so on) require the noun being counted to be in the genitive plural case. Złotych is the genitive plural of złoty. If the item only cost 2, 3, or 4 zlotys, you would use złote.
I always mix up the verbs for "to know". Why is it wiem here instead of a form of znać?
Use wiedzieć (here, the "I" form is wiem) for knowing facts or information. It is almost always followed by conjunctions like że (that) or question words like co (what). Use znać for knowing or being familiar with people, places, or noun objects. Since you are stating a fact here, wiem is the correct choice.
Why is there a comma before że?
In Polish, you must always put a comma before subordinate clauses. This means you always need a comma before connecting words like że (that), bo (because), or który (which). English often skips this comma, but it is a strict punctuation rule in Polish!

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