Not always. The word by is also rarely used as an adverb, without an object. (e.g. The birds flew by.)
Yes, "by" can function as a preposition in a sentence. It is used to show the relation or connection between two elements, indicating the means, method, or agent by which an action is done.
No, a preposition does not always have to be followed by a prepositional phrase. In some cases, a preposition can also be used on its own to show a relationship between two elements in a sentence.
No.
About is "almost always" a preposition. But it may be considered an adjective as in "up and about" and it is an adverb in the terms "come about" or "turn about."
No, a preposition is always part of a prepositional phrase. The preposition is the word that introduces the phrase and is followed by the object of the preposition.
"Always" is an adverb that typically indicates the constant or consistent nature of an action or state. It is not a preposition.
No, a preposition does not always have to be followed by a prepositional phrase. In some cases, a preposition can also be used on its own to show a relationship between two elements in a sentence.
It is almost always used as a preposition.
No.
The only preposition in the entire question is "in," and the word itself: preposition.
About is "almost always" a preposition. But it may be considered an adjective as in "up and about" and it is an adverb in the terms "come about" or "turn about."
no
No. It is commonly preceded by a preposition because it is the objective form of "who." You could say "who called whom" without using a preposition.
The word "for" is used as a preposition. It is used to indicate the purpose or reason for an action or the intended recipient of something.
"Always" is an adverb that typically indicates the constant or consistent nature of an action or state. It is not a preposition.
It is almost always used as a preposition.
The French preposition en is nearly always used directly in front of a noun, with no article.
It is never an adverb. It is always a preposition. The word "within" can be an adverb or a preposition, and the word "forthwith" (immediately) is an adverb.