☆★☆　English club　☆★☆コミュのWhat is difference about "Could" and "Would"

Yesterday I asked teacher about "Colud" and "Would",but teacher said"It's difficult explain,because slight different.".
So do you know someone can explain about those words?
If you know,please explain those words.

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[1] mixiユーザー 11月16日 03:29

Could is derived from 'can.'

Would is derived from 'will.'

I think the basic difference is the difference in assertiveness.

'He could have finished the test if he had more time." In this statement, there's a high possibility of the test being completed if the student had more time, but there is also a hint of uncertainty. Think of this statement as an opinion.

'He would have finished the test if he had more time." This statement has more assertiveness, as if stating a fact.

'Can do' - something is possible but it's not a given that the subject will do it.

'Will do' - something is possible and will be done by the subject.

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