Breakdown of Я не уверен в его решении.
не
not
я
I
в
in / to (direction)
уверенный
sure
решение
decision
его
his / its (possessive)
Questions & Answers about Я не уверен в его решении.
Why does the English word about translate to в in this sentence?
The short-form adjective уверен (sure or certain) specifically requires the preposition в plus the Prepositional case to express what you are sure about. You cannot use о (about) here.
Why is the short form уверен used here instead of the long form уверенный?
We use the short form here because it acts as the main predicate (the verb equivalent) of the sentence to describe a current state of mind. If you used the long form уверенный, it would describe a permanent character trait, like being a generally confident person.
Why does the word for decision end in -ии here?
The dictionary form of the word is решение, which is a neuter noun ending in -ие. Since уверен в requires the Prepositional case, the ending changes. Nouns ending in -ие are a special group that take -ии in the Prepositional case, making it решении.
Does the word его change its case to match the Prepositional case of решении?
No, it stays exactly the same. The third-person possessive pronouns его (his), её (hers), and их (theirs) are completely frozen in Russian. They never change their endings to match the case, gender, or number of the noun they describe.
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