This questions concerns the singular or plural form of the word "need". It might concern the property of the word "need" under different circumstances, which consequently affects whether it can inflect normally. Under which circumstance is it considered a catenative verb and which auxiliary verb?
I found both "need" and "needs" have many search results in terms of the phrase "one need/needs only".
1.Should one have any doubts about this proposition, one need only look to the perplexing case of Army Specialist Michael New.
2.But one needs only look at Ronsard to realise how much Catullus influenced him.
One is singular, should not need be changed to "needs" as well? Can anyone help me with this problem?