Spot the error in the given sentence:
According to a survey, only those forests which were not under village management succumbed from fires recently.
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Pay attention to subject-verb agreement, especially when dealing with past-tense verbs. Always check if the auxiliary verbs used are consistent with the main verb tense.
The correct sentence should read as follows:
"According to a survey, only those forests which were not under village management have succumbed from fires recently."
The error lies in part (D). The word “succumbed” is in the past tense, which should be followed by the auxiliary verb "have" for proper agreement. Therefore, the correct option is (4), where "have" should replace “were.”