We came across this tense in school:
If we had known about your problems we would have helped you?
But can I change would for instance into could??
Yes, you can use 'could' and 'might' apart from 'would' in third conditional clause. If we'd known your problems, we could have helped you. If they'd told me, I might have helped them.
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Yes, you can use 'could' and 'might' apart from 'would' in third conditional clause.
If we'd known your problems, we could have helped you.
If they'd told me, I might have helped them.
Note the comma after the 'if' clause and the period at the end of the sentence.
red witty 535If we had known about your problems, we would have helped you.