I come across a sentence like this,
"He's having trouble finishing the assignment."
I'm wondering if the clause "finishing the assignment" is
A) An adverbial clause of time or
B) A noun complement clause
To me, it's likely to be B) a noun complement cl. which tells the reader more about the head noun "trouble", explaining what kind of trouble (i.e. the "content" of the trouble) he is having.
However, according to a grammar book by Biber, he said a noun complement can realized in one of the four ways, i.e.
1) that clause
2) to-infinitive clause
3) "of" + -ing clause (e.g. "He had no intention OF singing at anyone's 21st birthday")
4) wh- clause
If my view is correct, it violate the grammar "rules" by missing "of" before the -ing (gerund)
Could someone share your opinion here?
Many thanks.