Breakdown of Я должен признаться в том, что рассчитываю на вашу помощь.
я
I
ваш
your [formal/plural] (ваш, ваша, ваше)
в
in / to (direction)
на
on, at / by (transport) / to (a place) / to (in answer to)
Questions & Answers about Я должен признаться в том, что рассчитываю на вашу помощь.
Why do we need в том before что in this sentence? Can't I just say признаться, что?
While English just says "admit that," the Russian verb признаться (to admit/confess) strongly pairs with the preposition в + Prepositional case. Because you cannot attach a preposition directly to что, Russian uses the "pointer" word то to hold the case. Therefore, в + Prepositional of то becomes в том, acting as a grammatical bridge to что.
Why is помощь (help) left unchanged, while ваша changes to вашу?
The verb рассчитывать (to count/rely) pairs with the preposition на + Accusative case for the object you are counting on. Because помощь is a feminine noun ending in a soft sign (a 3rd declension noun), its form does not change in the Accusative case. However, its modifier ваша must still change to the feminine Accusative form, вашу.
Why is the word я missing before рассчитываю?
The subject is already established by the first Я at the start of the sentence, and the -ю ending of рассчитываю makes it completely clear who is doing the counting. In Russian, dropping the pronoun in a subordinate clause is very natural and avoids unnecessary repetition.