Vedic Metre in its Historical Development c12.47

c12.47

159. In the following forms long quantity is regular in the Rigveda, but short quantity is a fairly frequent variation: (i) the imperative in *-ā*, *-a*; (ii) the second person plural in *-thā*, *-thanā*, *-tā*, *-tanā*; (iii) the neuter pl. in *-ā* (from stems in *-an*, *-van*, and *-man*), in *-ī*, and in *-ū*.