The term “word form” is not as simple as it seems at first, inexperienced look.
Firstly, this concept can be used in different contexts and, accordingly, have different meanings.
• It can be applied to a specific word. In this case, different forms are meant (for example, “head”, “head”, “head”; “walked”, “walk”, “walked”; “raspberry”, “raspberry”, “raspberry”) or word form.
• The concept is used to define a variety of grammatical forms. You can, for example, talk about forms of the feminine, past tense, singular or plural.
We can conclude that the word form is a morphological variation of one word or a whole class, containing a certain set of categorical grammatical meanings characteristic of a certain part of speech.
For example, the noun “hammer” is currently in the singular, dative case. The adjective "about red" - in the form of a single force, feminine, prepositional case. The verb "passed" is used in the past tense, sets. number.
An ordered complex of opposed morphological forms with related grammatical meaning forms a morphological category. For example, in nouns it can be the categories of number (singular and plural) and case, in verbs - type (perfect or imperfect), time (in our language there are only three tenses, in German - five), numbers.
The concept of "form of the word" can be interpreted in another way. This expression is a definite morpheme of belonging of words to a specific category (grammatical).
In Russian, the ending is responsible for the form of the word. Accordingly, in order to get different forms of the word, you have to change the ending.
For example, the noun "town" has a zero ending. It means that the masculine noun is currently in the singular, nominative. Changing the ending will entail a change in the form of the word: "town" (the ending "a" indicates the singular, genitive).
The verb "I write" has the ending "y", indicating the form of the present tense, unity. numbers, 1st person. The ending “eat” of the same verb will show the form of sets. numbers, 1st person.
Sometimes the formation of the word form can be with the help of the ending and the preposition (shop, in the shop, shop; black, about black, to black).
Forms of the word break up into the main part and the formal. The basis contains the main (lexical) meaning. The formative suffixes and endings available in the formal part are responsible for the grammatical meaning.
Naturally, word forms can only have mutable words (parts of speech). However, in the Russian language there are a number of words that remain unchanged, and therefore cannot have forms. The immutable parts of speech include the following:
• Adverbs (close, near, above, left, right, close).
• Categories of condition (joyful, dark, painful, sad, frosty). In the school standard course of the Russian language, words belonging to the category of state can be combined with adverbs.
• Interjection (oh, yeah, wow, cheers, come on (in the role of interjection).
• Prepositions (for, under, in).
• Unions (and, yes, to).
• Particles (that, not that).
• Onomatopoeic words (mu, meow, crow).
• The unchanging form of the verb is the participle (running through, painting).
These words do not change, do not bow, do not conjugate, do not agree with other words.
If unchanging words are independent parts of speech, then their connection with other words in the sentence will be carried out using control or adjacency. In the first case, only one word is immutable (I sing (how?) Joyfully, saw (where?) In the distance). In the second, both words will be unchanged (humming loudly, high above).