1. ''The 10 o'clock flight to sing will be an hour late''
->they announced that...
2.''they are doing an experiment on animals''
-> she said ...
3.''you have to learn hard for you exammination''
-> my teacher told me that..
1. ''The 10 o'clock flight to sing will be an hour late'' ->they announced that the 10 o'clock flight to sing would be an hour late. 2.''they are doing an experiment on animals'' -> she said they were doing an experiment on animals. 3.''you have to learn hard for you exammination'' -> my teacher told me that I had to learn hard for my exammination.