Final answer:
The direct speech 'I enjoyed myself last night.' changes to reported speech as: Anu said that she had enjoyed herself the previous night. Ashim's corrected statement would be reported as: Ashim said that he had been working until ten o'clock the previous night.
Step-by-step explanation:
The student's question involves converting direct speech into reported speech, which is a key component of English grammar. To convert the sentence, 'I enjoyed myself last night,' Anu said into reported speech, you would write: Anu said that she had enjoyed herself the previous night.
Similarly, for Ashim's statement 'I am working until ten o'clock last night', reported speech would correctly be: Ashim said that he had been working until ten o'clock the previous night. However, there is a tense inconsistency in the original sentence; it should properly be either 'I worked until ten o'clock last night' or 'I am working until ten o'clock tonight'.
As for the other excerpts provided, they do not relate directly to the student's question but are examples of narrative text that could also be transformed into reported speech or serve various analytical purposes in understanding narrative perspectives, voice, or style.