Concept:
An apology is an expression of regret for a mistake or fault.
The phrase
\[
\text{I am sorry}
\]
is commonly used for apologising.
Step 1: Understand the sentence.
The speaker says:
\[
\text{I am sorry}
\]
and admits forgetting to bring the book.
This shows regret.
Step 2: Identify the function.
The function of the sentence is:
\[
\text{apologising}
\]
Step 3: Final answer.
\[
\boxed{\text{apologising}}
\]
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Top AP ECET BSc Mathematics Analytical Ability Questions