Let angle A = 30° and angle B = 10°, so that their complementary angles are A′ = 60° and B′ = 80°, respectively.

Bess already knew about the painkillers and alcohol not mixing well.... I wasn't tracking very well.

It is, of course, important to draw a fundamental distinction here between Tense (a morphosyntactic property) and Time Reference (a semantic property). So, for example, in (60) below: (60) If I went there tomorrow, would you come with me? went is morphologically a past-tense form, and yet is used in a future timeframe.

Not long afterwards, Fortean writer Paul Harris contacted me concerning this putative sea serpent, kindly supplying me with a couple of newspaper cuttings […] that contained photos of its remains, plus various additional details that he had gathered during his own investigation of this case.