"Moreover  you should  know, Shariputra, the length
        of life of that Thus Come One and of those people  is
        unlimited."

          Section  Eight began by asking why Amitabha  Buddha
        has  the  name  Amitayus,  which  now  starts  to  be
        answered.   Shakyamuni   Buddha  tells  his  disciple
        Shariputra  (sariputra), "Moreover (punah) you should
        know  (khalu), the length  (pramanam?) of life (ayuh)
        of that (tasya)  Thus Come One (tathagatasya)  and of
        those  (tesam)   people  (manusyanam)   is  unlimited
        (aparimitam)."

          The  subject  of  this  sentence  is  ayuhpramanam,
        nominative   singular  of  the  neuter  noun  pramana
        "1ength/measure/extent," to which is added the neuter
        noun ayus "life/duration of life," ayuh before the p-
        of  pramana  when  put  into  compound  to  make  the
        compound noun ayuhpramana "length of life." Dependent
        on  the  subject  are  tasya  tathtagatasya, genitive
        singular  masculine, and  tesam  manusyanam, genitive
        plural  masculine.  No verb  "is"  is  expressed, but
        simply  the  perfect  passive  participle   aparimita
        "unmeasured/unlimited  (privative  prefix  a-  "un-",
        prefix pari- "around," and root  ma-  "measure." The
        participle   is  used   as  an  adjective   modifying
        ayuhpramanam.

          Since  the genitive  case denotes  possession, this
        amounts  to saying, "That  Thus  Come  One  and those
        people  have a duration  of life which is unmeasured,
        limitless."  Are you able to tell from this  much why
        that Buddha is called Amitayus?