NoDictionaries.com: You can find the word list for this fable online, and use it interactively (here are some tips on how to make best use of the tool).
READ OUT LOUD. Choose which marked text you prefer to practice with - macrons or accent marks - and read the text out loud until you feel comfortable and confident. Then, try reading the unmarked text at the bottom. It should be easy for you after practicing with the marked texts. :-)
MACRONS. Here is the text with macrons:
Puer mendāx, quī patris gregem pascēbat, libenter aliōs lūdificābātur. Aliquando ingentem clāmōrem sustulit: Auxiliō venīte; lupus adest! Accurrunt properē rūsticī et rīdentur. Proximō mense hunc dolum repetīvit. Paulō post rē vērā lupus appāret. Iam rursus clāmat: Auxiliō venīte; lupus adest! At nēmō accurrit. Māiōre vōce clāmat, lacrimat, ēiulat; frūstrā omnia. Tertium nōs dēcipere vult, inquiunt rūsticī. Ita lupus in gregem irrūpit et plūrimās ovēs dīlaniāvit.
ACCENT MARKS. Here is the text with ecclesiastical accents, plus some color-coding for the words of three or more syllables (blue: penultimate stress; red: antepenultimate stress):
Puer mendax, qui patris gregem pascébat, libénter álios ludificabátur. Aliquándo ingéntem clamórem sústulit: Auxílio veníte; lupus adest! Accúrrunt própere rústici et ridéntur. Próximo mense hunc dolum repetívit. Paulo post re vera lupus appáret. Iam rursus clamat: Auxílio veníte; lupus adest! At nemo accúrrit. Maióre voce clamat, lácrimat, éiulat; frustra ómnia. Tértium nos decípere vult, ínquiunt rústici. Ita lupus in gregem irrúpit et plúrimas oves dilaniávit.
UNMARKED TEXT. Here is the unmarked text - after practicing with the marked text that you prefer, you should not have any trouble with the unmarked text:
Puer mendax, qui patris gregem pascebat, libenter alios ludificabatur. Aliquando ingentem clamorem sustulit: Auxilio venite; lupus adest! Accurrunt propere rustici et ridentur. Proximo mense hunc dolum repetivit. Paulo post re vera lupus apparet. Iam rursus clamat: Auxilio venite; lupus adest! At nemo accurrit. Maiore voce clamat, lacrimat, eiulat; frustra omnia. Tertium nos decipere vult, inquiunt rustici. Ita lupus in gregem irrupit et plurimas oves dilaniavit.
IMAGE. Here is an illustration for the story (image source) from a 15th-century edition of the fables:
