Breakdown of En tiedä, onko väärennetty passi saman kokoinen.
olla
to be
ei
no / not (negative verb)
tietää
to know
passi
passport
Questions & Answers about En tiedä, onko väärennetty passi saman kokoinen.
Why is sama in the genitive form (saman) in saman kokoinen?
The adjective kokoinen means "-sized". To specify what kind of size, Finnish uses a modifier in the genitive case before it, literally meaning "of [something's] size". Here, saman means "of the same", making the whole phrase "of the same size".
The lesson mentions words like samanikäinen written as a single word. Why is saman kokoinen written as two words here?
It can actually be written either way! You will frequently see it combined as the compound word samankokoinen. Both the one-word and two-word versions are grammatically accepted and mean the exact same thing.
Why does the sentence use onko instead of a specific translation for the word "if"?
Finnish doesn't use a separate conjunction like "if" or "whether" for indirect yes/no questions (like "I don't know if..."). Instead, you take the main verb of that clause—in this case on (is)—and attach the question particle -ko to get onko (whether it is).
What verb form is väärennetty (forged)?
It is the past passive participle of the verb väärentää (to forge, to fake). At this level, you'll see this form (ending in -tu/-ty or -ttu/-tty) used constantly as a regular adjective to describe something that "has been done" to a noun.