The moles are moving in the green fields is the English equivalent of 'in agris viridibus agunt talpae'. In the word by word translation, the preposition 'in' means 'in'. The noun 'agris' is the masculine form in the ablative plural, and means 'fields'. The noun 'viridibus' agrees with 'agris', and means 'green'. The verb 'agunt' is the verb in the third person plural form of the present indicative tense, and means '[they] act, behave, bring up, do, drive, go'. The noun 'talpae' is a feminine gender noun in the nominative plural or genitive singular, and means 'moles'.