Usage of One ("only one transaction of each type need be tested")

[Ched133]

Hi

I have a grammar question about this sentence from one of my testbooks

"only one transaction of each type need be tested"

1) I thought the correct verb is NEEDS instead of NEED

One needs to be tested

2) Is "need be tested" better than "need to be tested"

Thanks

[Jamie (K)]

"...need be tested..." and "...needs to be tested..." are both correct, and neither one is better than the other.

In "...need be tested..." the verb is in the subjuntive, and that's why it doesn't have any tense marking.

[Ched133]

thanks
But what does it mean when the verb is in the subjuntive? How do i learn more about this?

[Jamie (K)]