
This model would be used, for example, in the famous Pied Piper of Hamelin story:
Who will pay for ridding the town of rats?
Who will pay the piper? Who pays the piper calls the tune.
"The wall" is not the direct object, but the indirect one, so a preposition is needed.
Who will pay for the wall?

+1
Should be "Who will pay for the wall?"
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License: CC BY 2.0 FRLogböker
This sentence was initially added as a translation of sentence #5048988
added by al_ex_an_der, 2016 M04 7
linked by al_ex_an_der, 2016 M04 7
linked by al_ex_an_der, 2016 M04 7
linked by duran, 2016 M04 8
edited by AlanF_US, 2019 M10 21
linked by CK, 2019 M10 21