Ex4:

1. They are worried that some people will use robots to do bad things.

2, If people plant more treees area, there will be no floods.

3. Hoi An is famos with old houses and building in traditional crafts.

4. Have you seen the latest Batman film?

5. We will be catching the train to London tomorrow at 9 o'clock.

Ex 4 : 

1 . They are worried that some people will use robots for bad things

2 . If people plant more trees in this area , there will not be no floods

3 . Hoi An is famous for old houses and buildings and traditional crafts

4 . Have you seen the latest Batman film ?

5 . He will be catching the train to London tomorrow at 9 o'clock