- David J. Allerton, “Over the hills and far away” or “far away over the hills”, in Dennis Kurzon et Silvia Adler (eds.), Adpositions: Pragmatic, Semantic and Syntactic Perspectives, 2008, ISBN 9789027229861
In other words, temporal in is prepositional not postpositional, and it rejects both duration premodifiers and degree intensifiers. Similar to in are for and during. The postposition ago differs only in that it rejects environment (a) but accepts environment (b):
a. *ago three weeks
b. three weeks ago
c. * (three weeks) ago the concert
d. * (a little) ago
The postposition ago thus rejects eventive complements (such as the concert) but accepts a preceding durational complement (such as three weeks); it also rejects degree intensifiers (such as a little).
ago 男性 (plural aghi)