DET Read and Select: Word Families and Lookalikes

Consider maintenance and maintainance. Both have a familiar verb at the front and a noun-like ending. Only maintenance is the standard English word.

That contrast shows both the value and the limit of word-family evidence in Read and Select. A known relative can help you inspect a displayed form, but English families do not always preserve every letter. You must recognize the whole word, not build one by attaching a plausible suffix.

This guide covers one narrow decision in the current Duolingo English Test task: how to use morphological relationships without accepting a merely word-like form. For the broader task routine, timing, and spelling checks, read DET Read and Select vocabulary. Continue through the DET vocabulary practice hub or the wider Exam English hub.

Duolingo’s current instructions ask whether a single displayed form is a real English word. The official help page says each item has a five-second limit and warns that some forms may look real while differing from actual words. The examples below are original practice, not recalled items or predictions.

What a family can prove

A word family can provide three kinds of useful evidence:

1. Meaning: the candidate has a plausible relationship to a known word.
2. Grammar: its ending could mark a noun, adjective, verb, or adverb.
3. Stored form: you remember seeing or using that exact relative in a natural phrase.

Only the third comes close to confirming the displayed word. The first two generate possibilities; they do not certify them. Decisive relates to decide, but decidive is not created by preserving the verb’s final sound. Explanation relates to explain, but explaination is not the standard noun.

The safe question is not “Could English form a word this way?” It is “Do family evidence and my memory converge on this exact form?”

Stable families and changing families

Some families preserve a base clearly:

• predict → prediction → predictable
• adjust → adjustment → adjustable
• resist → resistance → resistant

Others change letters or pronunciation:

• maintain → maintenance
• explain → explanation
• decide → decision → decisive
• pronounce → pronunciation

This is why a mechanical suffix rule fails in both directions. It may produce a convincing nonword such as explaination, or it may make a real changed form such as pronunciation look suspicious.

Treat family structure as a map to a neighborhood. It helps you locate the danger zone, but it does not supply the street number.

Pronunciation can reinforce that map, especially when a suffix changes stress or syllable shape. Still, sound is supporting evidence: homophones and reduced vowels mean that exact written form must remain the final recognition target.

Four lookalike types

1. A preserved base where English changes it

Maintainance feels logical because maintain is visible. The real noun is maintenance.

Preventive maintenance reduced the number of equipment failures.

Likewise, the real noun from explain is explanation, not explaination. A learner who trusts the visible verb too strongly may select the wrong form precisely because the family relationship is genuine.

2. A legal suffix on the wrong stem

The ending -ive forms many adjectives: responsive, persuasive, selective. That fact does not make decidive a word. The real adjective is decisive.

One decisive observation ruled out the earlier account.

The family is decide, decision, decisive. The noun and adjective share the changed decis- stem.

3. A genuine relative with a different meaning

Respectful and respective are both real. Respectful means showing respect; respective links people or things to the particular items associated with them.

The two researchers returned to their respective laboratories.

Read and Select asks whether the displayed form is real, not whether it expresses the meaning you first associate with the base. Rejecting respective because you expected respectful would confuse semantic fit with lexical existence.

4. One missing or added letter at a boundary

Occurrence contains two cs and two rs. The family includes occur, occurred, and occurrence. The lookalike occurence keeps enough of the family to feel familiar while dropping one letter.

Longer words invite silhouette reading. Focus on the seam between base and suffix: occur + rence, refer + ence, commit + ment. The seam is often where a near-form hides.

A five-second family check

Use this compact sequence during timed recognition practice:

1. Read the entire displayed form.
2. Identify a genuine base or relative, if one comes immediately.
3. Inspect the changed stem or suffix boundary.
4. Retrieve one phrase containing the exact candidate.
5. Decide YES or NO.

For decisive, a useful retrieval path is a decisive factor. For decidive, no equally familiar phrase should emerge. Absence of a phrase is not proof—the word might simply be unfamiliar—but a strong stored phrase is better evidence than “it looks academic.”

Do not spend the five seconds inventing several alternative spellings. Your training should make the exact form available quickly.

Worked item: inspect the relationship

Decide whether pronounciation is a real English word.

Step 1: locate the family. The verb pronounce is genuine.

Step 2: identify the tempting rule. The candidate appears to preserve the ou sequence from the verb.

Step 3: retrieve the noun. The stored phrase is clear pronunciation.

Decision: NO. The standard noun is pronunciation. The family changes internally; preserving all the verb’s letters creates a convincing lookalike.

This reasoning does not claim that all -ation nouns lose letters. It resolves this particular family through exact lexical knowledge.

Controlled set 1: real form or lookalike?

Choose YES for a real English word and NO for the constructed lookalike.

1. maintenance
2. explaination
3. decisive
4. decidive
5. pronunciation
6. pronounciation
7. occurrence
8. occurence

Answers and rationales

1. YES. Maintenance is the noun related to maintain.
2. NO. The standard noun is explanation.
3. YES. Decisive is the adjective in a decisive result.
4. NO. A real suffix does not make decidive a word.
5. YES. Pronunciation is the standard noun.
6. NO. The noun does not preserve the ou in pronounce.
7. YES. The standard noun has double c and double r.
8. NO. It is missing one r.

Controlled set 2: both, one, or neither?

For each pair, decide whether both forms are real, only the first is real, only the second is real, or neither is real.

1. respectful / respective
2. resistant / resistent
3. predictable / predictible
4. adaptation / adaption
5. argument / arguement

Answers and rationales

1. Both. They share historical material but have different meanings and uses.
2. Only the first. Resistant belongs with resist and resistance; resistent is the lookalike used here.
3. Only the first. The standard adjective is predictable.
4. Both. Adaptation is far more common, but adaption is also an English noun. This pair warns against treating rarity as impossibility.
5. Only the first. The standard noun is argument; it does not retain the final e of argue.

Item 4 matters. A neat spelling rule can wrongly reject a rare but genuine word. Build vocabulary from reliable reading and dictionaries during study; do not turn family patterns into absolute laws.

Build family cards that do not teach fakes

A useful card begins with real language:

Front: decide — “The committee must ___ today.”

Back: decision (noun), decisive (adjective), decisively (adverb); phrase: a decisive factor.

Add one personal danger note: “not decidive.” Keep the false form subordinate and brief. Repeatedly reading a large invented list can make false strings feel familiar.

For a ten-minute session, collect three genuine families from a reliable text. Say each form, write one natural phrase, cover the forms, and retrieve them from their grammatical roles. Finish with six timed recognition decisions. The aim is deeper storage of real words, not a catalog of imaginary ones.

Common mistakes

• Accepting any candidate with a familiar prefix or suffix.
• Preserving a base mechanically when the real family changes spelling.
• Rejecting a real relative because its meaning differs from the familiar family member.
• Assuming an unfamiliar or rare form must be false.
• Memorizing a predicted word list or a large bank of constructed nonwords.
• Checking only the first and last letters while missing a change in the middle.
• Treating morphology as proof instead of supporting evidence.

Final practice

Classify these forms, then name a genuine relative for every YES answer:

explanation — maintanance — respective — resistent — argument — decisively

Key: YES, NO, YES, NO, YES, YES. Genuine relatives include explain, respect, resist (for comparison with the NO form), argue, and decide. For each NO answer, write the correct family member once inside a phrase: routine maintenance; resistant to change.

For fresh vocabulary decisions in context, try Lyra Practice.

Final contrast drill: real rarity versus constructed familiarity

Classify adaption, predictible, argument, and arguement.

Answers: Adaption is a real, though less common, noun; predictible is not the standard form—the adjective is predictable; argument is real; arguement is a lookalike that wrongly preserves the final e of argue.

The contrast exposes two opposite errors. Rejecting every unfamiliar form would lose a genuine word such as adaption. Accepting every recognizable base-plus-suffix string would admit predictible and arguement. During study, verify rare forms in reliable dictionaries and store them inside natural phrases. During the timed item, decide from exact lexical recognition rather than from a rule you have just invented.

One last check: the task asks whether the displayed form is a real English word, not whether it is common, elegant, or the word you would choose in a sentence. Rarity and stylistic preference cannot substitute for lexical status.

Sources

• Read and Select — Duolingo English Test Help Center
• Test Structure — Duolingo English Test Help Center

Related

• DET Read and Select vocabulary
• DET Read and Complete word families
• DET Fill in the Blanks vocabulary in context
• DET vocabulary versus IELTS vocabulary

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