Forming Adjectives

Many adjectives in English are formed by adding a suffix to a noun, verb, or another adjective. Knowing these suffixes helps you choose the correct word form when a sentence needs a describing word.

What You'll Learn

• How to form adjectives from nouns and verbs using a wide range of suffixes
• How to recognise when a sentence requires an adjective rather than a noun, verb, or adverb
• How to choose the correct adjective-forming suffix in PSLE-level contexts
• How to handle spelling changes that occur when suffixes are added

When to Use

You already know common adjective suffixes like -ful, -less, -ous, -ive, and -able from earlier levels. Now you need to apply a wider range of suffixes accurately in varied contexts:

1. Describing a person's quality or nature: "She is a very courageous young woman." (courage + -ous)
2. Describing something that can be done: "The instructions were clear and understandable." (understand + -able)
3. Describing the absence of something: "The abandoned building looked dark and lifeless." (life + -less)
4. Describing origin, material, or relation: "The town has a rich cultural heritage." (culture + -al)
5. Describing a state or condition: "The explorers made a remarkable discovery in the cave." (remark + -able)

How to Form

Common Adjective-Forming Suffixes

Spelling Changes When Adding Suffixes

* Note: "courageous" keeps the -e to preserve the soft /dʒ/ sound of the "g."

Less Common but PSLE-Tested Suffixes

Key Rules

1. Identify the word class needed: Read the sentence and determine whether it needs an adjective. Adjectives usually appear before a noun ("a dangerous path") or after a linking verb like "is," "was," "seems," "becomes," or "looks" ("The path is dangerous").

2. Match the suffix to the base word: Not every suffix fits every base word. You cannot say "dangerful" -- it must be "dangerous." Learn common base-word-to-suffix pairings through practice.

3. Watch for spelling changes: When adding a suffix that starts with a vowel (-ous, -ive, -able, -ible, -al, -ent, -ant), you usually drop the silent -e from the base word: "create" becomes "creative," not "createive."

4. Distinguish -able from -ible: As a general guide, -able is added to complete English words (enjoy → enjoyable, comfort → comfortable), while -ible is often attached to Latin roots that are not standalone English words (terr → terrible, vis → visible). However, there are exceptions, so learn the most common -ible words by heart.

5. Do not confuse adjective suffixes with noun or adverb suffixes: Adding -ful creates an adjective ("hopeful"), not a noun. Adding -ness to an adjective creates a noun ("hopefulness"). Adding -ly to an adjective usually creates an adverb ("hopefully"). Choose the form that fits the sentence.

6. Beware of -ful versus -less: These suffixes often create opposite meanings from the same base word. "Careful" means full of care; "careless" means without care. Make sure you pick the meaning that fits the context.

7. Some words change form unexpectedly: A few base words do not follow regular patterns. For example, "strong" is already an adjective (not formed by adding a suffix), while "strength" is the noun. Learn to recognise which form is needed.

Common Mistakes

Clue Words

Words that signal an adjective is needed

a/an/the + ___ + noun (e.g., "a ___ student" needs an adjective in the blank)

is, was, were, seems, appears, becomes, looks, feels, sounds, tastes, smells, remains, stays + ___ (linking verbs followed by an adjective)

very, extremely, quite, rather, incredibly, somewhat, fairly, really (degree adverbs that modify adjectives)

Common adjective-forming suffix families

• -ful / -less: hopeful, cheerful, thoughtful, careless, harmless, useless
• -ous / -ious / -eous: famous, curious, courageous, adventurous, mysterious
• -ive / -ative / -itive: creative, active, competitive, sensitive, imaginative
• -able / -ible: comfortable, enjoyable, sensible, terrible, visible
• -al / -ial / -ical: national, commercial, musical, historical, political
• -ent / -ant: different, confident, pleasant, important, significant
• -ic: heroic, scientific, fantastic, dramatic, artistic
• -y / -ly / -ish / -en: rainy, friendly, childish, wooden, golden

Tip: When you see a base word in brackets in a word form selection question, check what word class the blank needs. If the blank comes before a noun or after a linking verb, you need an adjective -- then think about which suffix turns that base word into an adjective.

Practice Tips

1. Use the sentence position test: If the blank is between a determiner (a, an, the) and a noun, or after a linking verb (is, was, seems), you almost certainly need an adjective. Then work out which suffix fits the base word.

2. Build a personal suffix list: As you encounter new adjective-suffix pairs in your reading and practice papers, add them to a list organised by suffix. This helps you spot patterns and remember tricky words like "mysterious" or "responsible."

3. Check for spelling traps: After forming the adjective, re-read it to check for common spelling errors -- did you remember to drop the silent -e? Did you change -y to -i? Did you double the consonant if needed?

4. Cross-check with the opposite form: If the sentence context is negative, consider whether -less is a better fit than -ful. If the context is positive, consider -ful over -less. Matching meaning to suffix prevents careless errors.

Quick Reference