Final answer:
Taniya's direct speech is transformed into indirect speech by adjusting the tense of the verbs and the pronouns. The resulting indirect statement reports that Taniya apologized to Bipin for coming around without phoning first.
Step-by-step explanation:
The indirect speech of Taniya's statement to Bipin could be reported as follows: Taniya apologized to Bipin for coming around without phoning first. When constructing indirect speech, we typically change the tense of the verbs and adjust pronouns as necessary to suit the reported context. For example, Taniya's direct speech "I am sorry" becomes "She was sorry" in indirect speech.