Object of investigation,to the levels of language hierarchy and to two plans of the language

 
Polysynthetic 
or incorporated type of languages are characterized by the 
following features: 
a)
 
the word and the sentence coincide 
b)
 
the word and affix coincide 
c)
 
parts of speech are not differentiated. 
For 
example, in Chucotic language «вымынгынторген» expresses «я вынимаю 
руку». Here the sentence is alike a word. 
There are some languages of this type, for example, the so- called languages of 
American Indians. 
 
There exist some other classifications. The American linguist Edward Sapir 
classified language systems on the basis of two units: analytism and synthetism. All 
the languages may be described according to these two positions. 
 
The Russian linguist G. P. Melnikov classified languages on the basis of his 
inner determinants . G.P. Melnikov’s concept of inner determinants of languages
allows to interpret the traditional morphological classification of languages as a 
system of types opposed according to their inner determinants in historically 
formed specific communicative conditions acting as external determinants of 
languages. Besides, there exists the so- called quantitative classification of the 
American linguist Greenberg Joseph, this classification resumes presence or 
absence of the statistical frequency of the isolated agglutinated and inflected units. 
From this viewpoint Modern English is an analytical type and at the same time 
possesses some agglutinated features. 
 
Fortunatov F.F. considers the Arabic language to be agglutinated-inflected 
as the roots in this language consist of consonants, and the "harakats" which are 
used after each consonant express lexical and grammatical meanings. It is easy to 
change these harakats(to place them after each consonant letter and to take them 

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out). That is why Fortunatov F.F. considers this language to be agglutinated -
inflected.