I have a grammar question about the role of these bold "doing" in the below sentences and why they have "ing" form?

I am busy doing my homework.

I have trouble doing my homework.

I am at home doing my homework.

  • doing my homework (and single-word verb forms such as I'm busy working, I have trouble breathing, I'm at home reading) look to me like "adverbial elements of purpose / outcome". But apart from the matter of what to call them, what exactly is it you don't understand about such usages? Apr 28 at 17:09
  • Thanks. I want to know the grammar role of these structures(to review in grammar books), and accordingly use similar examples in my writings.
    – user135080
    Apr 28 at 17:19
  • In all your examples, the adverbial element starting with the word doing could in principle be discarded. What's left would still be a valid statement - just lacking in some detail (exactly what are you busy / having trouble with / doing at home?). Apr 28 at 17:25
  • could you refer me to a link or whatsoever describing it in detail? if doing is discarded, the remaining sentence does not make sense for me. I am busy "my homework"? unless we say: I am busy with my homework.
    – user135080
    Apr 28 at 17:41
  • I said you could discard the entire adverbial phrase starting with the word "doing"in each case. There's nothing "unusual" about the sentences I am busy and I am at home. You wouldn't be so likely to just say I have trouble, but syntactically it's not necessary for even that one to be followed by an adverbial clause (defining what I'm having trouble doing). Apr 29 at 11:28

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