> The sentence needs a slight alteration.
>
[quoted text clipped - 10 lines]
> Bill needs help.
> Bill does not need help.
[Re "So isn't there some transformation or conversion that need occur for
B that doesn't need to occur for A?"]
[...]
> Er, I think the first "need" is a form of the subjunctive.
Why would it be? The core statement is "There is a conversion that
[need|needs to] occur for B." Putting it in the interrogative with
"Isn't there" doesn't remove it to the realm of things that exist only as
conceptions of the mind (or whatever the usual definition of what calls
for the subjunctive mood). If it were instead "It need not be so", that
would be a state or condition existing as a conception rather than an
actuality, but--to me--it doesn't look that way here.

Signature
Cordially,
Eric Walker, Owlcroft House
http://owlcroft.com/english/