If you didn't help, I wouldn't pass the exam. (Bot for)

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` *** ` But for your help, I wouldn’t have passed the exam.

` -> ` But for + N `=` If it were not for

` @ ` CĐK `3:`

` -> ` If + S + had + V`3`/V-ed, S + would / could / might + have + V`3`/V-ed