These verbs are all compounds of the irregular verb "to be," (sum, esse, fui, futurus) and will frequently take the dative case. Verba mihi desunt, for instance, is the way a Roman would say "words fail me," or "I'm speechless." See Gildersleeve & Lodge: 347, Dative and Verbs Compounded with Prepositions, for more examples.

386 of the most frequently used irregular verbs in the Latin language with all four principal parts. These verbs belong to the 4th Conjugation: (blandior, blandiri, blanditus sum). Note that these verbs are passive in form but active in sense. Note also that the verb ORIOR, ORIRI, ORTUS SUM was very frequently conjugated by Romans as a 3rd and not a 4th conjugation verb. Thus the accent fell on the first syllable and not on the second syllable of ORITUR. As you will hear, I have decided again to go against convention and not include the final "sum" for the third principal part. Just remember to add it mentally yourself.