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Correct my sentence if it is wrong please:

"X could be helpful in a very simple case: where there is only one Y of each X type."

How would it be correct to say it in the past?

How to fix this:

"X could be helpful in a very simple case: where there was only one Y of each X type."

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  • 2
    Helpfull => helpful ...
    – Glorfindel
    Commented Jun 10, 2016 at 11:53
  • Let's be honest: I'm totally lost in your question.
    – Azami
    Commented Jun 10, 2016 at 12:30

1 Answer 1

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If I understand correctly, you're asking about the way to use the past tense for "could be".

Could is a modal, so we use what's technically called the past modal perfect, which uses the modal + "have" + a past participle.

To put this sentence in the past, it would be "X could have been helpful in a very simple case, where there was only one Y of each X type."

Here's a good reference: Could have, should have, would have.

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