In the sentence identify the segment which contains the grammatical error.

That man would have/ attacked you/ if you went/ that way.

The correct answer is 'if you went'. 

Key Points

• The given sentence is grammatically incorrect. 
• Here, 'if you had gone' should be used instead of 'if you went'.
• The structure of these kinds of sentences is "If+Subject+had+V3, S+would+have+V3".​
• Example:
  • If I had seen you, I would have stopped my car.  
  • If I had seen you, I would had stopped my car.
• Therefore, as per the points mentioned above, we find that the correct answer is Option 1. 
  ​

Correct Sentence: That man would have attacked you, if you had gone that way.

Hinglish

• दिया गया वाक्य व्याकरण की दृष्टि से गलत है।
• यहां, 'if you went' के बजाय 'if you had gone' का इस्तेमाल किया जाना चाहिए।
• इस तरह के वाक्यों की संरचना है "If+Subject+had+V3, S+would+have+V3"।
• Example:
  • If I had seen you, I would have stopped my car.  
  • If I had seen you, I would had stopped my car.
• इसलिए, ऊपर वर्णित बिंदुओं के अनुसार, हम पाते हैं कि सही उत्तर विकल्प 1 है।

Additional Information

• Third Conditional: The third conditional, also called the "Past Unreal" conditional is used to describe unreal situations in the past. It is often used to express regret about the past because the hypothetical situation that it describes is now impossible as a consequence of another past action. 
• The structure of it as follows:
  • If + past perfect, would + have + past participle. 
    • Example: If we had won, I would have been happy.