The alternation of consonant sounds in related words and forms of the same word is a property not only of Church Slavonic, but also of the Russian language: to write - I write, father - fatherly. In Church Slavonic, such alternations are regular and more frequent than in Russian. Look at the chains of Church Slavonic words - how the consonants change in them; perhaps this will help you more easily recognize other familiar words in their Church Slavonic sound form:
man - man - people; youth - youth - youths
God - God - about God; book - scribe - at the bottom
Spirit - Soul - about Dus
judge - judge (note that in Russian in this case “d” changes to “zh”!)
want - I want; light - sveta (in Russian - “t” changes to “h”).
Vocative case
In the Church Slavonic language there are all the same cases as in Russian, and approximately the same word genders change according to cases as in the Russian language - nouns, adjectives, pronouns, etc. Of course, in some forms the words we know will have slightly different endings than in Russian, but understanding (and then remembering) these forms is not so difficult. But in the Church Slavonic language there is another case used when addressing - vocative. All the words below are in the vocative case:
Lord God, Almighty Lord, Only Begotten Son, Jesus Christ, Heavenly King, Comforter, Soul of Truth, Most Holy Theotokos Mary, Lady Virgin Mary
Reverend Father Sergius.
Dual
In the Church Slavonic language there is not only a singular and a plural, as in Russian, but also a dual one: if we are talking about two people or objects, a special form is used. You just need to remember this - sometimes this easily explains the unusual sound of a seemingly familiar word. Here are some examples of dual numbers: Both ruce. My hand. Rukama is your own. No one else can work for two masters.
Forms of the verb "to be"
You should remember at least the basic forms of the Church Slavonic verb “to be.” Here's how it changes in the present tense:
Singular
I am
You are
He is
Plural
We are
you eat
They are
Az - I. The verb, like all others, also has dual forms: we esma (m. r.), nayu (3rd person, that is, they, if there are two of them) esta (m. r.).