1)they are working in the garden (we said). 2)he can swim (i said). 3)he has alredy seen this play (he told). 4)sophie is a very clever girl (he knew). 5)they have been waiting for him for ten minutes (my mother said).

1) We said that they were working in the garden.
2) I said that he could swim.
3) He told thar he had already seen this play.
4) He knew that Sophie was a very clever girl.
5) My mother said that they had been waiting for him for ten minutes.