There's No Klingon Word for Hello
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Despite the fact that more than 250,000 copies of Okrand's Klingon dictionary have been sold, very few people know how the language really works. There are maybe 20 or 30 people who can hold their own in a live, unscripted Klingon conversation and a few hundred or so who are pretty good with written Klingon.
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Klingon sentence structure is about as complex as it gets. Most people are familiar with the idea that verb endings can indicate person and number. In Spanish, the -o suffix on a verb like hablar (to speak) indicates a first-person singular subject (hablo—I speak) while the -amos suffix indicates a first-person plural subject (hablamos—we speak). But Klingon uses prefixes rather than suffixes, and instead of having six or seven of them, like most romance languages, it has 29. There are so many because they indicate not only the person and number of the subject (who is doing) but also of the object (whom it is being done to). In the "Live long and prosper" translation above, for example, the Da- on SIQ indicates a second-person subject and a third-person object ("You endure it"), and the bI- on the verb chep indicates a second-person subject and no object ("You prosper").
As if that weren't complicated enough, Klingon also has a large set of suffixes. Attached to the end of the verbs SIQ and chep is the ending -jaj, which expresses "a desire or wish on the part of the speaker that something take place in the future." Klingon has 36 verb suffixes and 26 noun suffixes that express everything from negation to causality to possession to how willing a speaker is to vouch for the accuracy of what he says. By piling on these suffixes, one after the other, you can pack a lot of meaning on to a single word in Klingon—words like nuHegh'eghrupqa'moHlaHbe'law'lI'neS, which translates roughly to: They are apparently unable to cause us to prepare to resume honorable suicide (in progress).
I'm too lazy to italicize all the Klingon here.