`1`. I want to know how much electricity a wind turbine produces in a day.

`-` S + want to know + wh + S + V: muốn biết 

`2`. Recycling things that we do not use anymore is a good idea.

`-` V-ing + be + a good idea: làm gì là một ý tưởng tốt

`3`. By stopping deforestation, we will make a major contribution to slowing global warming.

`-` By + V-ing, S + V: nhờ làm gì