SENTENCE STRUCTURE

[Anonymous]

They talked about what needed doing.

[Casiopea]

They talked about what needed doing.

Welcome.

They (Subject)
talked about (Phrasal Verb)
what needed doing (Object of the Verb)
what (pronoun)
needed (Verb)
doing (Object)

They talked about what needed doing.

Subject + Verb + Object

All the best, :D

[Francois]

Strange sentence to me -- what needed to be done? What's the difference?

FRC

[Casiopea]

Strange sentence to me -- what needed to be done? What's the difference?

FRC

They talked about what needed to be done/doing.

'what' functions as a pronoun.

All the best, :D