Educational worksheet for identifying prefixes, root words, and suffixes in common English words.

Let's solve this worksheet step by step. The goal is to identify the prefix, root word, and suffix for each given word. Remember:

- A prefix is added to the beginning of a root word.
- A suffix is added to the end of a root word.
- The root word is the base part of the word.

We’ll go through each word one at a time.

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1. preheat

- Prefix: *pre-* (means "before")
- Root word: *heat*
- Suffix: none

✔ Answer:
- Prefix: pre-
- Root Word: heat
- Suffix:

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2. unkind

- Prefix: *un-* (means "not")
- Root word: *kind*
- Suffix: none

✔ Answer:
- Prefix: un-
- Root Word: kind
- Suffix:

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3. undersea

- Prefix: *under-* (means "beneath")
- Root word: *sea*
- Suffix: none

✔ Answer:
- Prefix: under-
- Root Word: sea
- Suffix:

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4. submarine

- Prefix: *sub-* (means "under")
- Root word: *marine* (relating to the sea)
- Suffix: none

✔ Answer:
- Prefix: sub-
- Root Word: marine
- Suffix:

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5. comfortable

- Prefix: none
- Root word: *comfort*
- Suffix: *-able* (means "capable of")

✔ Answer:
- Prefix:
- Root Word: comfort
- Suffix: -able

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6. wonderful

- Prefix: none
- Root word: *wonder*
- Suffix: *-ful* (means "full of")

✔ Answer:
- Prefix:
- Root Word: wonder
- Suffix: -ful

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7. defrost

- Prefix: *de-* (means "remove" or "reverse")
- Root word: *frost*
- Suffix: none

✔ Answer:
- Prefix: de-
- Root Word: frost
- Suffix:

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8. overlook

- Prefix: *over-* (means "above" or "beyond")
- Root word: *look*
- Suffix: none

✔ Answer:
- Prefix: over-
- Root Word: look
- Suffix:

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9. quickly

- Prefix: none
- Root word: *quick*
- Suffix: *-ly* (adverbial ending, meaning "in a... manner")

✔ Answer:
- Prefix:
- Root Word: quick
- Suffix: -ly

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10. breathless

- Prefix: none
- Root word: *breathe*
- Suffix: *-less* (means "without")

✔ Answer:
- Prefix:
- Root Word: breathe
- Suffix: -less

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11. tallest

- Prefix: none
- Root word: *tall*
- Suffix: *-est* (superlative form)

✔ Answer:
- Prefix:
- Root Word: tall
- Suffix: -est

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12. worthless

- Prefix: none
- Root word: *worth*
- Suffix: *-less* (means "without")

✔ Answer:
- Prefix:
- Root Word: worth
- Suffix: -less

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13. replay

- Prefix: *re-* (means "again")
- Root word: *play*
- Suffix: none

✔ Answer:
- Prefix: re-
- Root Word: play
- Suffix:

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14. ungrateful

- Prefix: *un-* (means "not")
- Root word: *grateful*
- Suffix: none

⚠️ Wait — *grateful* itself has a suffix: *-ful*. But here, the root word is grate, and *-ful* is the suffix.

But in compound words like this, we often consider grateful as the root if it’s a known word. However, technically:
- *un-* = prefix
- *grate* = root
- *-ful* = suffix

But since "grateful" is a common word, and "ungrateful" is formed from it, it's acceptable to treat "grateful" as the root.

But let's analyze properly:

- ungrateful → *un-* + *grateful*
- *grateful* = *grate* + *-ful*

So, for ungrateful:
- Prefix: *un-*
- Root word: *grate*
- Suffix: *-ful*

✔ Answer:
- Prefix: un-
- Root Word: grate
- Suffix: -ful

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15. underground

- Prefix: *under-* (means "beneath")
- Root word: *ground*
- Suffix: none

✔ Answer:
- Prefix: under-
- Root Word: ground
- Suffix:

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16. tallest (duplicate)

Same as #11.

✔ Answer:
- Prefix:
- Root Word: tall
- Suffix: -est

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17. unhappy

- Prefix: *un-* (means "not")
- Root word: *happy*
- Suffix: none

✔ Answer:
- Prefix: un-
- Root Word: happy
- Suffix:

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18. preschool

- Prefix: *pre-* (means "before")
- Root word: *school*
- Suffix: none

✔ Answer:
- Prefix: pre-
- Root Word: school
- Suffix:

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19. disappear

- Prefix: *dis-* (means "not" or "away")
- Root word: *appear*
- Suffix: none

✔ Answer:
- Prefix: dis-
- Root Word: appear
- Suffix:

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Final Answer Table:

| WORDS | PREFIX | ROOT WORD | SUFFIX |
|-------------|--------|-------------|--------|
| preheat | pre- | heat | |
| unkind | un- | kind | |
| undersea | under- | sea | |
| submarine | sub- | marine | |
| comfortable | | comfort | -able |
| wonderful | | wonder | -ful |
| defrost | de- | frost | |
| overlook | over- | look | |
| quickly | | quick | -ly |
| breathless | | breathe | -less |
| tallest | | tall | -est |
| worthless | | worth | -less |
| replay | re- | play | |
| ungrateful | un- | grate | -ful |
| underground | under- | ground | |
| tallest | | tall | -est |
| unhappy | un- | happy | |
| preschool | pre- | school | |
| disappear | dis- | appear | |

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Notes:

- Some words have no prefix or no suffix.
- For ungrateful, we broke it into *un-* + *grate* + *-ful*, because "grateful" is not a standalone root; it's derived from "grate" + "-ful".
- Words like tallest appear twice — both entries are identical.

This worksheet helps students understand how words are built from smaller parts, improving vocabulary and spelling skills.