1. Introduced by Vinogradov.

The classification of phr.units introduced by Vinogradov was based on the semantic principals. V.classification is founded on the degree of semantic cohesion between the components of a phr.unit. units with a parshally transferred meaning show the veakest cohesion between their components. V.classified phr.units into 3 classes: phr.combinations, phr.unities and phr.fusions. phr.combinations are word groups with appartaly changed meaning (to steak to one’s word, to be good at smth). These expression are clearly motivated. Phr.unities are word groups with a completely changed meaning (to steak to one’s gones, to lose one’s head). Phr.fusions are word groups with a completely changed meaning but in a contrast to the unities there are demotivated (neac and crop, at sixes and sevens).

2. Smirnitskiy

S.offerd a classification which combines the structural and semantic principals. Phr.units in his classification are grouped according to the number and semantic significants of theit constituan parts. He subdivided them into 2 large groups:

a) one summet units which have 1 menaingful constituent (to give up, to be tired, to be surprised).

b) 2 summet and multi summit units which have 2/more meaningful constituance (first night, to fish in troubles waters).

With in itch large groups the phr.units are classified according to the cathegory of parts of speech of the summit constituent. One summit units are subdivided into :

1. Verbal adverbal units aquvalent to verbs in which the semantic and grammatical sententence coint sight in the first constituent (to give up).

2. Units aqvalent to verbs which the semantic senten in the second constituent and the grammatical sentence in the first (to be tired).

3. Prepositional substantive units acvivalent either to adverbs/copulars and having the semantic center in the substantive constituent and no grammatical center (by heart, by means of).

To 2 summit and multi summit phr.units are classified into:

1. Attributive substantive 2 summit units equivalent to nouns (black art).

2. Verbal substantive to summit units equivalent to verbs (to take the floor).

3. Phr.repetithions equivalent to adverbs (now or never)

4. Adverbial multi summit units (every other day).

3. Kunin

The classification of phr.units suggested by Kunin is based on the combine structural semantical principal and it also cinsiders the quotient of stability of the phr.units. phr.units are subdivide into the following 4 classes according to their function in communication determined by its structural semantic characteristics:

1. Nominative ephr.units are represented by verb groups including the groups with one meaningful word and coordinating phrases of the following type. (Wear and tear, well and good). The first class also includes word groups with a predicative structure such as: as the crow flies. And also predicative phrases of the time. (see how the lead lines, sheep that pass in the night).

2. Nominative communicative phr.units include word groups of the type. (to brake the eyes, the eyes is broken). That is verbal word groups which are transferred into a sentence where the verb was used in the passive voice.

3. Phr.units which are neither nominative no communicative include interjectional word groups. (good heavens, bless my soul).

4. Communicative phr.units are represented by proverbs and seins. (life is not a bad of roses).

5.Ommosova

Phr.units in modern English can be stadied from the contextual point of view. These approach is suggested by Amosova. Preciding from the sunction that individual meaning of polysemantic words can be observed in certan contenced and are dependend on them it is uguit that phr.units are to be defined throu specific types of context. 3 word groups make up variable context and the essential feature of phr.units is a non variable/fixed context. Non variability is understood as a stability of the word group. unlike word groups with variable members phr.units do not allow any substitution (small hours). The too criteria of the phr.units specialized meaning of the components and non variability of context display uniletteral . A.subdiveded phr.units into phrasems and idioms according to whether/not one of it components of the whole word group poses specializing meaning. Phrasems as a rule are too member word groups in which one of the members has specialized meaning dependent on the second component. Idioms are distinguished from phrasems by idiomatisy of the whole word group (red tape). Idioms are semantically and grammatical inseparable units.

5. Arnold

Phr.of units can be classified as parts of speech. This classification was suggested by Arnold. Here we have the following groups:

1. Noun phraseologies denoting an object, a person (skeletal in the cupboard, redbrick university).

2. Verb phr.denoting an action, a state, a feeling (to break the log jam, to get on smb coattails, to knows out, to make headlines, to take advantage).

3. Adjective phr.denoting a qulity (loose as a goose, high and mighty).

4. Adverbs phr.units such as: like a dog with 2 tails, by heart, against the grain, once in a blue moon, by who or by cruck, before one can say jack robenson.

5. Preposition phr.units in the course of on the strock off.

6. Interjection phr.units (catch me, well I never, bless my soul).

In A. classification there are also sentence equivalents proverbs, quotations (the sky is the limit, what makes him tick, I’m easy).