[Grammar] We will do what we can to help.

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kadioguy

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In the OALD9, it says:

do
verb

used to refer to actions that you do not mention by name or do not know about

We will do what we can to help.
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Why not We will do what we can do to help?

Why is no main verb in what we can?
 

GoesStation

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The second do is implied. Can can work this way.
 

Matthew Wai

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Can other modal verbs work this way too?
'I must do what I should.'
 
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