Structure: By obeyingthe speed limit, we can save energy, lives, and it costs...

I have a difficulty with structures, please help me.Thanks in advance.
Find and correct the errors in parallel in this following sentence:
By obeyingthe speed limit,we can save energy,lives,and it costs us less!

Hi duc

I guess there are a couple of ways you could reword that sentence. For example:

[i]- [color=blue]Obeying the speed limit means [color=blue]saving [color=green]energy, lives and money!

  • If we obey the speed limit, we can save [color=green]energy, lives, and money![/i]

The words in green are parallel.
In the first sentence, the words in blue are also parallel.
.

thank you very much!You are really helpful!