μακαριοι adjective - nominative plural masculine
makarios  mak-ar'-ee-os: supremely blest; by extension, fortunate, well off -- blessed, happy(-ier).
οι definite article - nominative plural masculine
ho  ho: the definite article; the (sometimes to be supplied, at others omitted, in English idiom) -- the, this, that, one, he, she, it, etc.
πενθουντες verb - present active passive - nominative plural masculine
pentheo  pen-theh'-o: to grieve (the feeling or the act) -- mourn, (be-)wail.
οτι conjunction
hoti  hot'-ee: demonstrative, that (sometimes redundant); causative, because -- as concerning that, as though, because (that), for (that), how (that), (in) that, though, why.
αυτοι personal pronoun - nominative plural masculine
autos  ow-tos': the reflexive pronoun self, used of the third person , and (with the proper personal pronoun) of the other persons
παρακληθησονται verb - future passive indicative - third person
parakaleo  par-ak-al-eh'-o: to call near, i.e. invite, invoke (by imploration, hortation or consolation) -- beseech, call for, (be of good) comfort, desire, (give) exhort(-ation), intreat, pray.