sindarin_grammar1-1  Exercise 2: Pedo mellon a minno
====================================================

  pedo     speak!          attested (imperative)
  mellon   friend          attested
  a        and             attested
  minno    enter!          attested (imperative)

"Speak, friend, and enter."

The two words showing the same ending: pedo and minno both end in -o, the
imperative ending (Chapter 7 of this course).

Whole phrase: attested (the inscription on the Doors of Durin).
The glosses of the individual words are the standard ones; check Eldamo.