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:
De formae praestantiā certāmine ortō inter hirundinem et cornīcem, cum diū multumque certātum verbīs esset, cornix tandem: Quidquid, inquit, formōsitātis in tē sit, vernum hoc solummodo tamen est, at egō etiam hieme dūrō.
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):
De formae praestántia certámine orto inter hirúndinem et cornícem, cum diu multúmque certátum verbis esset, cornix tandem: Quidquid, inquit, formositátis in te sit, vernum hoc solúmmodo tamen est, at ego étiam híeme duro.
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:
De formae praestantia
certamine orto
inter hirundinem et cornicem,
cum diu multumque
certatum verbis esset,
cornix tandem:
Quidquid, inquit, formositatis
in te sit,
vernum hoc solummodo tamen est,
at ego etiam hieme duro.
IMAGE. Here is an illustration for the story (image source) showing a crow in the snow:
