1. Subject of theoretical grammar. Analytic and synthetic word forms

3. The Conjunction
Semantic features
Every conjunction has its own meaning, expressing some connection or
other existing between phenomena in extralinguistic reality.
When discussing prepositions, we noted that in a certain number of cases the
use of a given preposition is predicted by the preceding word: thus the verb depend
can only be followed by the preposition on (or upon), the adjective characteristic
only by the preposition of, etc. In such cases the preposition has no meaning of its
own. Conjunctions in this respect are entirely different. Their meaning is
independent of preceding words.
Syntactic features
Two levels are distinguished — that of phrases and that of sentences.
On the phrase level it must be said that conjunctions connect words and
phrases. It is the so-called co-ordinating conjunctions that are found here, and only
very rarely subordinating ones.
On the sentence level it must be said that conjunctions connect clauses (of
different kinds). Here we find both so-called co-ordinating and so-called
subordinating conjunctions.
In comparing prepositions with co-ordinating and subordinating
conjunctions we cannot fail to notice that while prepositions have nothing in
common with co-ordinating conjunctions, some prepositions are very close in
meaning to subordinating conjunctions, and in some cases a preposition and a
subordinating conjunction sound exactly the same.
It should also be noted that the difference between prepositions and
conjunctions is much less pronounced in Modern English than in Russian, where
prepositions are closely connected with cases, while conjunctions have nothing
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whatever to do with them. In English, with its almost complete absence of cases,
this difference between prepositions and conjunctions is very much obliterated.
4. The Particle