5.4 Suffixes: Inflection, Derivation, and Endings

Reading the back edge of a word

A suffix is a bound morpheme placed after a base. In morphology practice, suffixes often mark plural, past time, future time, actor, object, location, possession, or comparison. They are especially useful because they appear at the end of different roots, making patterns easier to compare.

Two broad suffix types matter for reasoning. Inflection changes grammatical information without usually creating a new basic word. English examples include cats, walked, and taller. Derivation creates a related word or changes the role of the base, as in teach to teacher or happy to happiness. Artificial practice-style systems may not follow English categories exactly, but the distinction helps organize clues.

Suppose an invented system gives mip = open, mipta = opened, sol = close, and solta = closed. The ending ta likely marks past time. That is inflection-like because the action remains the same. Now suppose mipo = opener and solo = closer. The ending o creates a person or tool role. That is derivation-like because it builds a related noun from an action root.

Suffix evidence table

Stacked suffixes require careful segmentation. In mipok, the ending may be o + k rather than ok. Evidence comes from mipo and solok. If o marks actor and k marks plural, then mipok means openers. If you treat ok as one suffix, you may miss how to form a new plural actor word.

The most common trap is reading a suffix from only one example. If nalep means stones, ep could mark plural, but it could also mean many, pile, or a noun class unless more examples clarify it. With mirep = birds, the plural hypothesis gets stronger. With kurep = houses, it gets stronger again. Multiple roots make suffix meaning more reliable.

Another trap is assuming English order. An artificial system might put tense before plural, plural before tense, or use only one ending at a time. If examples show root + actor + plural, keep that order. If examples show root + plural + actor, keep that order instead. DLAB-style aptitude work rewards obedience to the given pattern, not preference for familiar grammar.

Under timed conditions, suffixes are often the fastest clues. Scan the last two or three characters of each invented form, group repeated endings, and write compact labels such as PL, PAST, DOER, PLACE, or OBJ. Then test a new form by stripping endings from right to left. If the remaining root matches the meaning family, your analysis is likely on track.

Public-source DLAB facts support a careful preparation frame: the exam is standardized, government-administered, aptitude-focused, approximately two hours, and described in public military material as 126 multiple-choice questions. That does not authorize claiming exact official morphology item types. It does support practicing rule extraction with original, clearly labeled examples like the ones in this section.