Affixes I: mal-, -in-, -ej-, -et-, -eg-

mal- flips a root to its exact contrary, and it is the single biggest reason Esperanto vocabulary is smaller than it looks. Learn granda, varma, fermi and juna and you have also learned malgranda, malvarma, malfermi and maljuna for nothing. The prefix changes no grammar: whatever ending the root carried, the opposite keeps it, so an adjective stays an adjective and a verb stays a verb.

The trap is that mal- means opposite, not negative. ne denies a statement, sen- marks absence, and mal- names the far end of a scale, so malbona is bad rather than not good. Beware the false friends too. malgraŭ, malantaŭ, maldekstra and malsupre are ordinary words that happen to open with the same three letters.

-in- makes the female member of a pair. patro gives patrino, frato gives fratino, edzo gives edzino, reĝo gives reĝino. The result is almost always a noun in -o, and it stacks happily with other suffixes, which is how you get servistino from servi.

Two things catch people out. First, virino looks like a derivative of a male root but vir- is simply the root for human male, so the word is built like any other. Second, most Esperanto roots are neutral rather than masculine: amiko, instruisto and kuracisto cover anyone, so adding -in- is a choice you make when the sex matters, not an obligation. When you want both sexes at once, ge- is the prefix you reach for instead.

-ej- names the place where the root happens. lerni gives lernejo, loĝi gives loĝejo, kuiri gives kuirejo, vendi gives vendejo. The result is a noun in -o, and the root is usually a verb, though a noun root works too: preĝejo is built on preĝi, while kafejo sits on kafo.

The nuance worth holding on to is that -ej- gives you a room, a building or a site, never a container. A place you put things in is -uj- or -ing-, so a shoe shop is a ŝuvendejo but a shoe box is not. And do not stretch it into abstraction: an office as an institution or a post is a different idea from the room it occupies, and Esperanto keeps those apart.

-et- shrinks the root. domo gives dometo, monto gives monteto, varma gives varmeta, and on a verb it softens the action, so ridi gives rideti, to smile rather than to laugh. The ending stays whatever the root had.

The point people miss is that -et- is not just malgranda in shorter form. malgranda domo is a house that happens to be small; dometo is a cottage, a thing of its own kind, and often carries warmth or affection with it. That is why patrineto reads as mummy rather than as a short mother. Its mirror is -eg-, which enlarges and intensifies, and eta survives as a free-standing adjective meaning tiny.

-eg- is the opposite number of -et-: it blows the root up. granda gives grandega, varma gives varmega, bona gives bonega, pordo gives pordego. As with -et-, the ending of the root survives, so an adjective stays an adjective and ridi becomes ridegi, to roar with laughter.

Watch the intensity, not just the size. On a quality root -eg- means extremely rather than physically large, which is why bonega is excellent and varmega is boiling. And read new words with care before you assume the suffix is there: legi, regi, regxo and peco are single roots, and pordego is a gate, not merely a big door you could still call granda pordo.