Breakdown of Я целиком согласен с твоим убеждением.
я
I
твой
your [informal]
с
with (also со)
согласен
in agreement (short form)
Questions & Answers about Я целиком согласен с твоим убеждением.
Why are the words твоим убеждением in the Instrumental case here?
The short-form adjective согласен (agree) is used with the preposition с (with), which requires the Instrumental case for the noun phrase that follows. This is a set pattern for this lesson: согласен с + Instrumental.
If a woman is speaking, does the word согласен change?
Yes. In Russian, expressing agreement usually uses a short-form adjective rather than a verb. Because it is an adjective, it must match the gender of the subject. A female speaker would say Я целиком согласна.
The word целиком means completely, but could I use полностью here instead?
Yes, полностью and целиком are often interchangeable when meaning completely or entirely. Целиком comes from the word целый (whole) and literally means 'as a whole', fitting nicely with accepting someone's entire conviction.
What is the dictionary form of убеждением, and why does the pronoun take the form твоим?
The dictionary form is убеждение, which is a neuter noun. In the Instrumental case, neuter nouns ending in -е change to -ем. The possessive pronoun must match this gender and case, so it takes its neuter Instrumental form твоим.