823. (2.) Some verbs have more than one form of the perfect stem: as,

#eō#, _go_, old #īī# (765), common #iī#, rarely #īvī# (767); #pluit#,

_it rains_, #pluit#, sometimes #plūvit#. See also #pangō#, #parcō#,

#clepō#, #vollō# or #vellō#, #intellegō#, #pōnō#, #nectō#, and

#adnectō#, #saliō# and #īnsiliō#, #applicō#, #explicō# and #implicō#,

#dīmicō# and #necō# in the dictionary. Some compound verbs have a form

of the perfect which is different from that of the simple verb: as,

#canō#, _make music_, #cecinī#, #concinuī#, #occinuī#; #pungō#, _punch_,

#pupugī#, #compunxī#, #expunxī#; #legō#, _pick up_, #lēgī#, #dīlēxī#,

#intellēxī#, #neglēxī#; #emō#, _take_, _buy_, #ēmī# (#adēmī#, #exēmī#),

#cōmpsī#, #dēmpsī#, #prōmpsī#, #sūmpsī#.

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