I just wanted to note that Mr. linguist, who teaches others about the level of their language skills and plays translator, is not able to form the plural of the word modus.

But nothing ... in this case it is not surprising. 🙄

A že mám dobrou náladu, přidám vtip: Father asks daughter, "What are you going to do next week?" „Jedeme na universitu do Mnichova, s Erasmusem“ „S Erasmem, kočičko, s Erasmem, tak se to skloňuje.“ „Hm.“ „A jak tam jedete?“ „Mikrobem, tati.“