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4)Notional words, modal words, form words, the interjection, words of affirmation and negation

According to the lexical meaning, syntactical functions and morphological categories all the words in English may be divided into the following five classes.

1. Notional Words

a) Most of the words in English as well as in other languages belong to the notional words which denote phenomena existing in reality. These words denote things, qualities, actions and so on. All the other words play a secondary part. They may connect the notional words, underline the shades of meaning, etc. The main idea is always expressed by notional words.

b) Their syntactical functions are very closely connected with their meaning. Since the notional words express the main idea in the language, they form the parts of the sentence. So the parts of the sentence are expressed only by notional words. The subject, the object, the predicate, etc. are always expressed by notional words.

c) Morphologically the notional words form the class of words having morphological categories. All the changeable words in English belong to notional words.

2. Modal Words

Modal words express modality in the sentence, that is the relation of what is said to reality. We have such modal words in English as of course, certainly, surely, no doubt, naturally, perhaps, maybe, and others. Modal words do not denote any phenomena existing in reality. Syntactically modal words cannot form any part of a sentence. They are not connected syntactically with any other words. They may be used in the function of a parenthesis or may form sentences themselves, e.g. Will you speak to him? - Certainly.

Morphologically modal words are invariable.

3. Form-Words

Form-words do not denote any phenomena existing in reality. They are used to determine notional words or to connect them. They have no independent syntactical functions. Morphologically form-words are invariable. According to the role they play in the sentence form-words are divided into two classes: connective form-words (prepositions, conjunctions, etc.) and determinatives such as articles, particles (only, merely, even, also, simply, just, too).

4. The Interjection

Interjections are words used to express different emotions such as joy, sadness, anger, etc., e.g. oh, bosh, hallo, ha, alas, well, now, ah, etc. Interjections cannot be parts of the sentence. They are not connected with any words of the sentence. They are always used as separate sentences in themselves. Morphologically they are invariable.

5. The Words of Affirmation and Negation

Practically this class consists of two words "Yes" and its equivalents and "No" and its equivalents. They are used to express affirmation or negation. They are not connected with other words in a sentence. Morphologically they are invariable. They may form sentences themselves.

Thus we see that modal words, form-words, interjections and words of affirmation and negation have several points in common: they do not denote any phenomena existing in reality, they are not used as parts of a sentence and morphologically they are invariable.