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No, the word "same" is not a preposition. It is an adjective that indicates that two or more things are identical or not different from each other.
No, it is not a preposition. The word meanwhile is an adverb, or more rarely a noun.
No, it is not a preposition. The word differently is an adverb (meaning in a way that is not the same).
No. A preposition is a word that is used to connect a noun or pronoun to another word in a sentence. A compound preposition is the use of two or more words to do the same thing. Enjoy is a verb. Enjoyed is past tense for the verb enjoy.
Yes, you can use the word but as a preposition. It is a preposition the same as about, by, for, and than.
A preposition is one word, a word that begins a prepositional phrase. A prepositional phrase contains more than one word.
No. The word school is a noun, and more rarely a verb (to teach). It cannot be a preposition.
No, it is not a preposition. It is a verb, and more rarely a noun.
The preposition is up.
The preposition is "over" and the entire phrase is "over the workstation." A preposition is usually just one word, but it can be more.
No. Towards is a preposition. The word "toward" can be a preposition or an adjective (with the antonym untoward).
Both may be prepositions, though "for" is practically always a preposition. The word but is almost always a conjunction, more rarely a preposition (no one but me), an adverb, or a noun.