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Definition (fragment from LSEG Definition M8)
"Prepositions" are used to link two different syntactic elements, and to set particular relations (of time, direction, possession, state, etc.) ...
It happens many times that prepositions, conjunctions, and some adverbs have identical forms; therefore, it is easy to confuse or to use them incorrectly. The best method to detect prepositions is by analyzing the syntactic functionality of each linked sentence element.
Prepositions link two sentence elements having different syntactic functions. For example: verbs and their direct objects; nouns and their attributes; etc. Conjunctions link two morphologic/syntactic elements of the same type (including two prepositions), or two sentences. The adverb determines only one sentence element (a verb, a noun, an adjective, or another adverb) or an entire sentence. Few instances of detecting prepositions are highlighted next.
We met her after lunch. (preposition)
We thanked them after they did it. (conjunction)
We left shortly after. (adverb)
The structure employed to present, summarily, prepositions in this page is:
1. Types of Prepositions
2. Using Prepositions
3. Verbs with Prepositions
These Grammar Notes are not sufficient to understand the topics presented. For accurate and detailed information we recommend LOGICALLY STRUCTURED ENGLISH GRAMMAR.
According to their form, prepositions are:
5. prepositional phrases
Following is a fragment from LSEG: a list of common prepositions.