I am making a presentation on conlangs, and I make a passing reference to Lojban. I mention that is an engineered/logical language, but I also want to show the people what is this all about.
The best way is to present some 3 or 4 exemplary phrases which might show most of the peculiarities and uniqueness of the language, showing functions that make it apart from the natural languages, especially English.
For example, if some English people were curious about what that famous language called "Latin" is all about, the presenter would display a sentence which highlights the use of cases, verb tenses, and proceed to a brief syntactic analysis. He would perhaps make use of participles which are not that common in English.
That would be an adequate taste of Latin that would enable people realize what make Latin the language it was.
Of course, the presenter would avoid much technical details and trivialities. Perhaps he would not go as far as to mention what are the differences between is, hic, iste and ille.
I have tried to "study" some Lojban in order to detect such peculiarities, and find or compose some exemplary phrases that would make people understand why it was created (and why it was presented in some sci-fi works as an intergalactic language). However I got tired before finding anything that impressed me enough. The most peculiar feature is that it has no parts of speech but rather "functions" and "parameters" (to use some programming jargon). Other than that, I found the types of the articles interesting, but not important or simple enough to be displayed in such a presentation (although I am open to suggestions). The few short basic phrases that I learned are not that idiomatic to display the logical/disambiguative features of the language.
If anyone of you can think of any Lojban phrases that can work as introductory, demostrative, or exemplary of the language...?

