1."We will come back again"they said (promise)
=> they promise to come back again
2"Keep quiet"the tencher said to us (told)
the teacher told us to keep quiet

3."You'd better not swim too far from the shore, "the lifeguard said to us (advise)
the lifeguard advise us not to  swim too far from the shore

4."you should join the football team ,Eric"said the teacher (encourage)
the teacher encourage Eric to join the football team

5." I will give it to him tomorrow"John said (promise)
John promise to give it to him the following day
6. "I'd like Lan to become a doctor"my mum said (want
my mum said she want Lan to become a doctor