[IDEM libro nono ad Plautium. ] §45.1.89.prSi a colono, cui fundum in quinquennium locaueram, post tres annos ita stipulatus fuero: 'quidquid te dare facere oportet?', non amplius in stipulationem deducitur, quam quod iam dari oportet: in stipulationem enim deducitur, quod iam dari oportet.
[THE SAME, On Plautius, Book 9] If, after three years, I have made a stipulation as follows with a tenant to whom I had leased a tract of land for five years: 'Whatever you ought to give or do?', there is no more brought into the stipulation than what already ought to be given; for that is brought into the stipulation which already ought to be given.
si autem adiciatur 'oportebitue', etiam futura obligatio deducitur.
But if 'or shall be obliged' is added, a future obligation is also brought in.