what could have done to change something or what must have done to change something?

what could have done to change something vs what must have done to change something

Both phrases are not correct in English. The correct phrasing would be "What could have been done to change something?" or "What must have been done to change something?".

Last updated: March 31, 2024 • 460 views

what could have done to change something

This phrase is not correct in English. The correct form would be "What could have been done to change something?"

The correct structure is 'could have been done' to indicate a possibility or ability in the past.

Alternatives:

What could have been done to change something?

what must have done to change something

This phrase is not correct in English. The correct form would be "What must have been done to change something?"

The correct structure is 'must have been done' to indicate a necessity or obligation in the past.

Alternatives:

What must have been done to change something?

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what could have done to change something vs what must have done to change something