262. Purpose may be expressed by a subordinate imperative clause,
introduced by "por ke":
Mi faras gxin por ke li helpu vin,
I do it in order that he may help you.
Mi ekkriis por ke vi auxdu,
I cried out in order that you should hear.
Li venos por ke ni estu felicxaj,
he will come that we may be happy.
Mi studas por ke mi lernu,
I study that I may learn.
Ili restu por ke ni punu ilin,
let them stay for us to punish them.
[Footnote: Cf. the expression of purpose by the infinitive with "por"
(98), which however cannot be used except when the subject of the main
verb is the subject of the subordinate verb, or when the object of the
main verb is the subject of the subordinate verb.]