English grammar error-spotting (subjunctive after ‘‘If I were you’’ and conditional consistency): Read the sentence split into parts (A–D) and identify the erroneous segment; select ‘‘No error’’ if all parts are correct: ‘‘If I am you / I would have seen to it / that I won the prize. / No error.’’

Given data

• A: ‘‘If I am you’’
• B: ‘‘I would have seen to it’’
• C: ‘‘that I won the prize.’’
• D: ‘‘No error.’’

Concept / Approach
For unreal/hypothetical comparisons, English uses the subjunctive ‘‘If I were you …’’. Also, match the conditional type: with a present-time hypothetic advice, the natural main clause is ‘‘I would see to it …’’; with past-time hypothetic, use ‘‘If I had been you, I would have seen …’’

Step-by-step check
Step 1: Replace A with ‘‘If I were you …’’ (subjunctive).Step 2: Keep or adjust B–C depending on intended time: advice (present) → ‘‘would see’’; counterfactual past → ‘‘had been … would have seen’’.

Correction (one natural fix)
‘‘If I were you, I would see to it that I won the prize.’’

Common pitfalls

• Using ‘‘am’’ after ‘‘If I … you’’.
• Mixing conditional time frames.

Final Answer
If I am you