Allen and Greenough's New Latin Grammar for Schools and Colleges
J. B. Greenough, G. L. Kittredge, A. A. Howard, Benj. L. D'Ooge, Ed.

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[*] 542. The particles ubi , ut , cum , quandō , either alone or compounded with -cumque, may be used as Indefinite Relatives (in the sense of whenever), and have the constructions of Protasis (cf. § 514):—

1. “ cum id malum negās esse, capior ” (Tusc. 2.29) , whenever you (the individual disputant) deny it to be an evil, I am misled. [Present general condition.]
2. “quod profectō cum mē nūlla vīs cōgeret, facere nōn audērem ” (Phil. 5.51) , which I would surely not venture to do, as long as no force compelled me. [Present, contrary to fact: cf. § 517.]
3. “ cum videās eōs dolōre nōn frangī, dēbeās exīstimāre, etc. ” (Tusc. 2.66) , when you see that those are not broken by pain, you ought to infer, etc. [Present general condition: cf. § 518. a.]
4. “ cum rosam vīderat, tum incipere vēr arbitrābātur ” (Verr. 5.27) , whenever he saw a rose he thought spring had begun. [Past general condition: cf. § 518. b.]
5. “id ubi dīxisset, hastam in fīnīs eōrum ēmittēbat ” (Liv. 1.32.13) , when he had said this, he would cast the spear into their territories. [Past General Condition, repeated action: see § 518. c.]

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Temporal Clauses with postquam, ubi, etc.