1."Don't swim in this lake ! It's too deep"
=>I warned you not to swim in this lake,it was too deep.
2."Would you like my torch?" I said - " No, thanks. I have one of my own" he said
=>I asked if he would like my torch and he said that he had one of his own
3."Were the children happy here?" I asked - " Yes, they were" she said
=>I ask her if the children had been happy here and she said that they had been.