Ответ:
1) Mother said she would set off for London the next week!
2) Mother said she was drinking cold water, because she was
thirsty”
3) Mother said She went to the art school
4) “ Why are you late, Dima?”= пример
Mom asked why I (Dima) was late
Переделать в косвенную речь «Who is your best friend?” Mom asked Who my best.