1 I asked Boris if his friend lived in London.
2 I asked the man if he was living in a hotel.
3 Nick asked his friend if he would stay at the Hilton.
4 He asked me if I often went to see my friends.
При изменении прямой речи в косвенную меняем:
Времена группы Present на времена группы Past :
Present Simple на Past Simple
Present Continuous на Past Continuous
Present Perfect на Past Perfect
Present Perfect Continuous на Past Perfect Continuous
Past Simple на Past Perfect
Past Perfect не меняется
will на would
can - could
must - had to
Если в косвенную речь переделываем вопрос, то соблюдаем прямой порядок слов - т.е. сначала подлежащее, затем сказуемое.