1. They/worried/that/some people/use/robots/do/bad things.

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

2. If/people/plant/more trees/area/there/be/no/floods

=> If people plant more trees around this area, there will be no floods.

1) When/Nam/ten/he speak/ English/phone.

When Nam was ten, he spoke English on phone.

2) My sister/write/poems/she eight.

My sister wrote poems when she was eight

3)They/worried/that/some people/use/robots/bad things.

They worried that too some people to use robots is wrose things  

4)If/people/plant/more trees/area/there/be/no floods.

If people plant more trees, the erea there will be no flood.

5) If/we/recycle/old newspapers/we/save/lot/labour/trees.

If we recycle old newspapers we will save a lot of labour of trees