1 It's a good idea to wear a helmet when you ride a bike, but it isn't compulsory.
You don't have to wear a helmet when you ride a bike, but it's a good idea
2 Dan said "I don't know Rachel's email address”
Dan said that he didn't know Rachel's email address
3 A robber has taken a gold necklace from the bank.
A gold necklace has been taken from the bank.
4 Lottie arrived at the cinema five minutes before I got there.
When I got to the cinema, Lottie had arrived there five minutes earlier.