переводишь их на косвенную речь
3 Children must spend a lot of time outdoors,
4 Wendy should buy a present for her freind,
5 Tom couldn"t dance when he was four,
6 We don't have to get up early,
7 Don was able to write the test well,
8 I am able to do it,
9 You can't go to Washington, D.C. now,
10 Parents shouldn't shout at their children,

He said children had to ( must) spend a lot of time outdoors.She said Wendy should buy a present for her friend.Tom said that he couldn’t dance when he had been  four.We said that we didn’t have to get up early.The teacher said that Don had been able to write the test well.She said she was able to do it.He said that I couldn’t go to Washington, D.C. then. They said that parents shouldn't shout at their children.