The term 'catching fish' is a noun phrase or a predicate.
Examples:
I enjoy making lures for catching fish. (the noun phrase is functioning as the object of the preposition 'for')
Those boys are catching fish with a bucket. (predicate consisting of the verb 'are catching' and the direct object 'fish')
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.
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".
There is no preposition in "catching fish is one".
The conjunction in the sentence is and, which joins the compound object of the preposition 'in'.
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.
There is no conjunction in the sentence, "Catching fish is one of the oldest pastimes."
An entire sentence can't be a conjunction, and there is no conjunction in that sentence.
Thousands - noun of - preposition years - noun ago - adverb fish - noun were - verb (auxiliary) caught - verb (past participle) in - preposition nets - noun and - conjunction traps - noun
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 like can be a verb, or a conjunction (meaning as, similar to), and more rarely a noun.It is arguably acting as a preposition in constructions such as "swims like a fish" (truncated clause like a fish swims).
The two words 'and traps' are a (a) conjunction (and) and a plural noun (traps).The conjunction 'and' joins the compound object of the preposition 'in' (nets and traps).
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).