Praxis Grammatica - Chez Moi in Latin

The 17th century Praxis Grammatica tells you how to predict the near future:

[ 29 ] Cras mane eris apud me. [English Translation]

Praxis originally came from a Greek word prâxis 'deed, act, action'.

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Praxis Grammatica gives great examples of Latin sentences in the guise of wondrously useful advice. Please feel free to post your interpretation of this bit of Latin and when it would be used.