we will have to wait for few years to find out this regulation is a good one because that will only be the case if we actually reach the required omission
We will have to wait for a few years to find out whether this regulation is a good one, because that will only be the case if we actually reach the required emission levels.
We will have to wait for few years to find out this regulation is a good one, because that will only be the case if we actually reach the required emission