904. The future participle suffix is #-tūro-#, nominative #-tūrus#,
#-tūra#, #-tūrum#, which is often changed to #-sūro-#, nominative
#-sūrus#, #-sūra#, #-sūrum# (912).
This suffix is added to a theme after the manner of the perfect
participle (906): as, #rēctūrus#, _going to guide_; #laudātūrus#, _going
to praise_.
905. Some future participles have a different formation from that of the
perfect participle: as, #mortuus#, _dead_, #moritūrus#; see also in the
dictionary #arguō#, #fruor#, #orior#, #ruō#, #secō#. And some verbs have
two forms of the future participle: as, #āgnōscō#, #īgnōscō#, #hauriō#,
#iuvō#, #pariō#. Some verbs which have no perfect participle have a
future participle: as, #acquiēscō#, #appāreō#, #ardeō#, #caleō#,
#careō#, #doleō#, #ēsuriō#, #fugiō#, #haereō#, #incidō#, #iaceō#,
#-nuō#, #parcō#, #rauciō#, #recidō#, #sonō#, #stō#, #valeō#.