1

I would like to know which one of these two questions is correct, grammar-wise?

What should I have done?
or
What should have I done?

I would appreciate an explanation, too.

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  • 2
    Never heard What should have I done. Where did you find this? – SovereignSun Nov 30 '16 at 7:28
  • Some people contract should've and move it as a unit, producing What should've I done? But it's fairly rare, and only when contracted in speech. Ditto with could've. – John Lawler Nov 30 '16 at 18:10
1

The only inversion needed is applied to the auxiliary, which in this case is should:

What should I have done?
NOT What should have I done?

0

if so no grammar mistake

What should have I done?

but i suggest

What should I have done?

because it is more powerful and more

What else should I have done?
What should I have to do?
What should I have done here?
What should I have done different?
What should I have done instead?
What tests should I have done?

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