Dave's ESL Cafe's Student Discussion Forums

[river1974]

Dear teachers:

(a) Therefore, the above differences are merely some detailed steps before the power control is performed, which are easily achievable by the skilled person, need no inventive efforts therefor and bring no unexpected effects.
(b) Therefore, the above differences are merely some detailed steps before the power control is performed, which is easily achievable by the skilled person, needs no inventive efforts therefor and brings no unexpected effects.

Which one is correct?

Thanks.

[iitimone7]

i would sat the second...iitimone7

[river1974]

Thanks litimone7. I agree with you in this case.