1) Thanh said to her , " will I finish my exercise at home ?"

⇒⇒ Thanh said to her if he would finish his exercise at home

* Cấu trúc câu trần thuật Yes/No question :

[[ S + ask(ed) + O + if/whether + S(theo O) + V(lùi 1 thì về QK)
2) He said to his friends, “I must go home now”.
→ He said that he must to go home then
3)= > Nga said to her brother that she couldn't answer that question