Hiya GB ! Well I asked myself a similar question sometime ago... I think the answer is that the verb 'to need' also works as a modal auxiliary.
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Grammarian-botThink of that sentence as:
In the following sentences, the author hasen't used "to" for the verb find. Why is it so? Please explain.
1. To eliminate it, one need only find some condition that is necessary to its existence and then eliminate that condition. (Writen in the book)
CalifJimThe correct possibilities are as follows.Well CJ thanks for clarification. But as usual, you have tempted me to ask you a little more than I should know. Y
only has negative polarity is this construction, so it is the element that makes the expression non-assertive, hence eligible for the modal use of need.
CJ