It is a noun.
You can tell this because there is 'a' before fish. A, the and an go before nouns:
a dog / an apple / the captain.
or sometimes the order is adjective + a/the/an + noun:
a black dog / an unripe apple / the old captain
There is no conjunction in the sentence, "Catching fish is one of the oldest pastimes."
In the sentence, "Catching fish is one of the oldest pastimes.":the preposition = of;the verb = is (a linking verb).There is no conjunction or adverb in the sentence.
Yes, fish in this sentence is a noun.In the example sentence, the noun fish is part of the noun phrase 'catching fish', which is the subject of the sentence.
The word 'fish' is a noun, a word for a thing (things).In the example sentence, the noun fish is part of the noun phrase 'catching fish', which is the subject of the sentence.
In this sentence, "catching fish" is a gerund: a verb that is doing the job of a noun. "Catching fish" is the subject of the verb "is".
In the example sentence, the word 'is' is a linking verb.A linking verb acts as an equal sign, the object of a linking verb restates or renames the subject (catching fish = pastime).
In the the above sentence the preposition is the word OFas it shows a relationship between the pronoun ONE to the noun phrase THE OLDEST PASTIMES.A preposition is a word that shows the relationship of one word to another.
An entire sentence can't be a conjunction, and there is no conjunction in that sentence.
Yes, nouns are things, places or people.
The parts of speech for each word in the sentence are:catching: gerund, part of noun phrase which is the subject of the sentence;fish: noun, part of noun phrase which is subject of the sentence;is: verb (linking verb);one: indefinite pronoun, object of the linking verb, a subject complement;of: preposition, connects the object of the preposition 'pastimes' to the subject complement 'one';the: definite article introducing the noun 'pastimes';oldest: adjective, describing the noun 'pastimes';pastimes: noun, object of the preposition 'of'.
No, in the example sentence, the word 'is' is a linking verb.A linking verb acts as an equal sign, the object of a linking verb restates or renames the subject (catching fish = pastime).
There is no preposition in "catching fish is one".