I am afraid that you will not get a definitive answer. Writers on this subject use the terms in different ways. I think that nearly every writer would agree that the word in your third example is a noun.
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Laborious=Let's take the first example first. In my first example sentence, "Building" is a gerund. It's internally a verb (taking 'Taj Mahal' as a direct object) and externally a noun. Right, teachers?Wrong: it’s not a noun at all; it is entirely a verb, just as built is in I built the Taj Mahal. In
Aspara GusWrong: it’s not a noun at all; it is entirely a verb, just as built is in I built the Taj Mahal. In Building the Taj Mahal took many years, it is not a matter of the word building itself having a function like that of a noun, but of building being head of an expression whose function (subject) is like that of an expression headed by a noun, i.e., of an NP. The f
fivejedjonThis is not 'wrong'.Of course it is, and also thoroughly misleading. You can only confuse a learner by telling them building in that first sentence is a noun, especially when it has a direct object. Not to mention it can take as dependent an adverb but not an adjective or a determiner.
Aspara GusOf course it is, and also thoroughly misleading. You can only confuse a learner by telling them building in that first sentence is a noun,OK, I wouldn't tell them it was a noun, but I would tell them it was a gerund, and that a gerund acts partly like a noun. That is one of the features of a gerund.
fivejedjonbut it also functions as the subject of a verb (a property normally associated with a noun/pronoun)..Not quite, 5jj. The subject is building the Taj Mahal, not just building. And telling a learner the subject is building is likely to give them the idea that it’s a noun. It’s not; it’s a verb, through and through.
Aspara Gus The subject is building the Taj Mahal, not just building.Not my best example.
fivejedjonHow about "Swimming exhausts me"?That’s ambiguous, strictly speaking. Swimming could be either a noun or a verb there, i.e., either an NP or a clause. In the noun interpretation it can be modified by an adjective (Regular swimming exhausts me) and in the verb interpretation by an adverb (Swimming regularly exhausts me).
fivejedjonNow, in the verb interpretation, would you say that 'swimming' is:b
a) a gerund?
b) a verb through and through?
fivejedjonIn the noun interpretation, Would you say that 'swimming' is:b
a) a gerund?
b) a noun through and through?