2

What's the role of the word flying in both sentences and drones in the latter, please?

  • Troy enjoys flying.
  • Losi's hobby is flying drones.

And how to differentiate between a gerund and a complement in sentences?

3

[i] Troy enjoys flying.
[ii] Losi's hobby is flying drones.

'Semantic role' is the underlying relationship that a participant has with the main verb in a clause.¹ But I guess that's not what you're asking for; I believe by 'role' you mean the grammatical functions of the phrases.

Complement is a grammatical function that has a close relationship with the verb. It's usually obligatory. So it's clear that 'flying' in [i] is complement of the verb enjoy.

Gerund is a verb form.² So it's inappropriate to say 'flying is a verb functioning as a gerund'. Flying in [i] is a verb (in the form of gerund) functioning as complement of the verb 'enjoy'.

Drones in [ii] is a noun that functions as object of the verb flyingFlying, on the other hand, is a verb (gerund) that heads the gerund clause flying drones, which functions as the complement of the copula is.


¹More info is here.

²I don't distinguish between 'gerund' and 'present participle'. So what you call 'present participle' is a gerund here.

³An object is a kind of complement. So it's also okay to say drones is a complement of the verb flying.

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