Prepositions are location, and behind is a location, so here's an example: I put my phone down behind the chair.
In the sentence "She looked behind," "behind" functions as a preposition indicating the location where she looked.
It's a preposition.
After is a preposition of time, usually. "My sister was born after me." Behind is a preposition (or adverb) of place. "Our house was behind the airport." (preposition); "The children walked behind." (adverb).
it is a preposition
The preposition is "behind." The phrase "behind the patient's bed" modifies the verb "stood."
No it's a preposition.
No, "follow" is not a preposition. It is a verb that means to come after or behind something or someone.
It can be, when whatever something is behind is named (e.g. behind the door). Without an object, behind is just an adverb (e.g. The book was left behind).
The word beautiful is an adjective. The word behind is a preposition.
You use a preposition in a prepositional phrase, such as "I will be with you in a minute."
"Behind" can be used as a preposition, an adverb, or an adjective, depending on its context in a sentence.
The word "when" is an adverb that can function as a conjunction. The other 4 can all be prepositions.