Because Hebrew commonly uses לפני ש־ + future for something that has not happened yet.
So:
Together, לפני שנחתום means before we sign.
נחתום is the 1st person plural future form of לחתום (to sign).
Breakdown:
The root is ח-ת-מ.
The prefix ש־ is a very common Hebrew connector meaning something like that, which, or sometimes just marking a subordinate clause.
In this sentence:
So ש־ helps introduce the dependent clause after לפני and after לוודא.
לוודא means to make sure, to verify, or to confirm.
So:
It is a very natural word here, especially in a context like checking a document or contract.
This is a modern Hebrew spelling convention. A consonant v sound is often written with double ו.
So לוודא helps signal the pronunciation more clearly.
It is pronounced roughly levade.
Because אין and לא do different jobs.
Here the sentence is saying that no strange thing exists in the agreement, so אין is the right choice:
שאין is just:
So שאין means that there isn't or that there aren't.
Hebrew often attaches little words like ש־ directly to the next word.
Literally, משהו means something.
But in a negative sentence, English often prefers anything, so:
A slightly more explicit Hebrew version would be:
So the sentence is natural, especially in everyday speech.
Because it matches משהו, which is treated as masculine singular.
So:
If the noun were feminine, the adjective would usually change to the feminine form.
Without vowel marks, בהסכם can be ambiguous in writing.
It can represent:
Only context tells you which one is meant. In this sentence, the meaning is in the agreement.
Not from the spelling alone.
In unpointed Hebrew, רוצה can be read as:
So אני רוצה could mean I want said by either a man or a woman. In speech, you hear the difference.
You can move it.
Both are natural:
Starting with לפני שנחתום puts a little more focus on the timing: before we sign...
A useful transliteration is:
lifnei she-nakhtom, ani rotze/rotza levade she-ein mashehu muzar baheskem
Notes:
The strongest stresses are roughly:
lifNEI she-nakhTOM, aNI rotZE/rotZA levaDE she-EIN maSHEhu muZAR ba-hesKEM