An adverb is a word or phrase that modifies or qualifies an adjective, verb, or other adverb or a word group, expressing a relation of place, time, circumstance, manner, cause, degree, etc.. (e.g., gently, quite, then, there ).
1- adverbs of frequency are words used to change or qualify the meaning of a sentence by telling us when things happen.
Example: I presently study daily to improve my skills.
2- Adverbs of degree tell us about the intensity of something.
Example: In our city the weather turns extremely cold in winter.
A preposition is used to show a relationship between the noun and pronoun in a sentence. A preposition must always be followed by a noun or pronoun in a sentence. Prepositions can never be followed by a verb.
Prepositions of movement or direction are used to show movement from one place to another. These prepositions are most often used with verbs of motion and are found after the verb.
Example: The girl is sitting among her friends.
conjunctions are a group of words used to connect clauses or sentences or to coordinate words in the same clause (e.g. and, but, if ).
Subordinating conjunctions connect two ideas or an independent clause to a dependent clause.
Example: I like to swim at the lake although its water is cold.
