Find out which part of the sentence has an error and choose that part as your answer out of (1), (2), and (3). If the sentence is free from any error, then choose your answer as choice (4).‘We know where it begins, but we don't know that where it ends.’
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In relative clauses, avoid unnecessary words like "that" if the sentence structure doesn't require them.
Step 1: Evaluate the sentence.
The sentence contains an error in the phrase "that where it ends." The correct construction should omit "that" in this case. Step 2: Correct the error.
% Option
(1) ‘We know where it begins: No error here.
% Option
(2) But we don't know: No error here.
% Option
(3) That where it ends: Incorrect. "That" is unnecessary in this structure. The correct phrasing is "but we don't know where it ends."
% Option
(4) No error: Incorrect, as there is an error in option (3).