Is was an adjective?

  No, the word "was" can't be used as an adjective. Rather, it can be used as a linking verb or an auxiliary verb. Explanation: Click this link

Is "by" a Preposition?

Yes,the word "by" can function as a preposition in a sentence.


Explanation:



Today we will learn about whether "by" is a preposition or not.






Is "by" a Preposition?




Remember that we can use "by" as a preposition.Besides, we can also use "by" as an adverb.





But in this post I will show you the usage of "by" as a preposition and I will give you the explanation of the usage of "by" as a preposition.



Let me give you an example:



●He will buy the tickets of the train by phone.


●Explanation:Here "by" has been used as a preposition because "phone" which is a noun is the object of " by."


◆Remember that every preposition has a object.The object of the preposition can be a noun,noun phrase or noun clause.Also,bear in mind that an adverb does not has any type of object.




More Explanation:


A preposition in a sentence builds the relationship between a noun to a noun or a verb to a noun.


●He will buy the tickets of the train by phone.


Here,"by" has built the relationship between the phone which is a noun and "buy "which is a verb.



Nice to Know:


Structure of Noun phrase:


●Determiner + Noun

(Determiner may not obtained in some cases before noun)





So,"phone is a noun or noun phrase in the following sentence.Besides,the train is a noun phrase in the following sentence.



●He will buy the tickets of the train by phone.



◆Structure of Prepositional phrase:


•Preposition +Noun phrase



So,"by phone is a prepositional phrase.Besides,"of the train" is a prepositional phrases.





Now observe the following examples:


#He will buy the tickets of the train by phone.



In this example,"by phone"is a prepositional phrase from structural side of prepositional phrase but from functional side,"by phone" is an adverbial prepositional phrase because like adverb "by phone " is modifying the verb "buy". 



Actually,"by phone" is modifying the verb "buy" by answering the question "how".Besides,"of the train"is a prepositional phrase from structural side but here it is an adjective (prepositional phrase) because it is modifying the noun train like an adjective.



Conclusion:Centainly,by is a preposition.



◆Now consider the following example:

●A crow of people waiting for an important announcement is standing by.



Explanation:Here "by" means near.Here "by"does not has any object.So,by is an adverb in this sentence.





Nice to Know:

He will give me the pen in the market.




Explanation:Here "give"is a transitive verb.It can takes noun after it without preposition."Me and the pen are the two objects of the verb give.You can write the above example like the following.




In the market,he will give me the pen.








●He comes here in the morning.




Here "come" is an intransitive verb.Here "morning"is a noun.Intransitive verb cannot take a noun directly after it.It can take nouns after it with the help of preposition.





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