vern
ווערן
to become
Takes זײַן in the perfect tense: איז געוואָרן (iz gevorn) — also the auxiliary for the Yiddish passive voice.
Used in a sentence
ער ווערט מיד.
Er vert mid.
He becomes tired.
איך וויל ווערן אַ דאָקטער.
Ikh vil vern a dokter.
I want to become a doctor.
עס ווערט קאַלט.
Es vert kalt.
It's getting cold.
Quick check
Which YIVO form means "to become"?
1. VERN
✓
2. ZAYN
3. BLAYBN
4. HEYSN