Question : Select the word segment that substitutes (replaces) the bracketed word segment correctly and completes the sentence meaningfully. Select the option 'No correction required' if the sentence is correct as given.
They said that they (were understandings) his theory very well.
Option 1: understanding
Option 2: No correction required
Option 3: have understand
Option 4: understood
Correct Answer: understood
Solution : The correct option will be the fourth option.
Explanation : The correct past tense form of the verb "understand" is "understood". This substitution provides the appropriate past tense and completes the sentence meaningfully.
Therefore, the correct sentence would be: "They said that they understood his theory very well."