Full Idea
The three 'modi' of time are persistence, succession and simultaneity.
Clarification
'Modi' are forms
Gist of Idea
The three modes of time are persistence, succession and simultaneity
Source
Immanuel Kant (Critique of Pure Reason [1781], B219/A177)
Book Reference
Kant,Immanuel: 'Critique of Pure Reason', ed/tr. Guyer,P /Wood,A W [CUO 1998], p.296
A Reaction
I find such an assertion quite breathtaking in its confidence. How does he know this? It is tempting to try to reduce the three modes down to two or one. See Ideas 2608 and 4230 for McTaggart's reduction to two.
Related Ideas
Idea 2608 For McTaggart time is seen either as fixed, or as relative to events [McTaggart, by Ayer]
Idea 4230 A-series expressions place things in time, and their truth varies; B-series is relative, and always true [McTaggart, by Lowe]