Rewrite each sentence, using report speech

Rewrite each sentence, using report speech:
1."how long will you stay England?", Tam's friends asked him =>.....................
2."what language do you speak?"=>.....................
3."how much does this coat cost?"=>.....................
4."what aspect of learning English do the students find most diffcult?" the teacher said to his students=>.....................
ét ô ét:<