>>16
In my understanding the numbers in x1 x2 x3 are actually supposed to be subscripts, though they're much more often written like "x1" for convenience. They are pronounced x1 = "xy xi pa", x2 = "xy xi re", x3 = "xy xi ci", x4 = "xy xi vo", and x5 = "xy xi mu". ("xy" is the letter X, which can be used by itself as a variable, and "xi" means subscript, plus the name of the number.)
The place structure is the heart and soul of a gismu. You should look to the structure to tell you not just how to use the word structurally, but also what the relationship is really about.
x1 is the "fa" place, and comes first without a transformation.
x2 is the "fe" place, and comes first when "se" is used.
x3 is the "fi" place, and comes first when "te" is used.
x4 is the "fo" place, and comes first when "ve" is used.
x5 is the "fu" place, and comes first when "xe" is used.
The words with four and five places are rare, but they are also some of the most important words: cusku, fanva, klama. Those three words alone actually have fourteen different concepts hidden inside of them-- things like "lo se klama", a destination, "lo ve cusku", a medium of expression, and "lo te fanva", a language into which something is translated.
Gismu are more difficult to learn than a noun or a verb, because of this way that they have many nouns and verbs inside of them, rolled up into a ball. Gismu seem strange at first, but they have a logic to them which will become clear to you once you have learned enough of them.