What did they do about the problem?
I think the structure of the sentence is like the following:
Subject = they
Verb = do
Object = What
Adverbial = about the problem
Is it correct? Please explain it to me.
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Sign up to join this communityWhat did they do about the problem?
I think the structure of the sentence is like the following:
Subject = they
Verb = do
Object = What
Adverbial = about the problem
Is it correct? Please explain it to me.
What did they do about the problem?
What= Relative pronoun serving as an object (they did do [what])
Did= Auxiliary Do
They= Subject
Do= Verb
About = Preposition
Problem= Object of preposition
or
About the problem= Adverbial phrase modifying verb "do"
We can see that as TRomano said, there is inversion.