| Past Modal | Usage | Example | | :--- | :--- | :--- | | | Past advice or regret (something was a bad idea). | You should have told me the meeting was cancelled. | | Could have | Past ability (possible but didn’t happen). | She could have called but she forgot. | | Would have | Past result of an unreal condition. | I would have helped if I had known. | | Might have | Past possibility (not certain). | The delay might have been due to weather. |
I can't help ________ (worry) about the final results of the presentation. summit 1 unit 2 test