A preposition always introduces a
phrase. (A phrase is a group of related words used as a single part of speech
and not containing a verb and its subject.) A prepositional phrase is a group
of words beginning with a preposition and usually ending with a noun or a
pronoun.
• in the laboratory before the class
• under the table along the street
The object of a preposition (the word
or phrase following it) is always in the objective case. The noun or
pronoun that ends the phrase is the object of the preposition that begins
the phrase. Prepositional phrases do not stand by themselves. They are parts of
a sentence and are used as modifiers, sometimes as adjectives and at other
times as adverbs. When the object is a compound noun, both nouns should be in
the objective case. For example, the phrase “between you and me”is frequently
and incorrectly written as “between you and I.” Me is the
objective form of the pronoun, and I is the subjective form.
Many words that function as
prepositions also function as adverbs. If the word takes an object and
functions as a connective, it is a preposition; if it has no object and functions
as a modifier, it is an adverb.
PREPOSITIONS :The
manager sat behind the desk in her office.
ADVERBS
:The customer lagged behind; then he came in and
sat down.
Luis Alberto Viades Valenci. 2002. Teaching Technical English Writing
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