Educational worksheet for identifying prefixes, root words, and suffixes in various 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 "too much")
- 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 — actually, *grateful* itself has a suffix: *-ful*. So let’s break it down:
- *grateful* = *grate* + *-ful* → but *grate* isn’t a root here; better to think of *grateful* as the root in this context.

But in this case, we are analyzing ungrateful:
- *un-* (prefix) + *grateful* (root word) → no suffix added beyond that.

So:
- Prefix: un-
- Root word: grateful
- Suffix: none

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

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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:
- Prefix: none
- Root Word: tall
- Suffix: -est

✔ 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- | grateful | |
| underground | under- | ground | |
| tallest | | tall | -est |
| unhappy | un- | happy | |
| preschool | pre- | school | |
| disappear | dis- | appear | |

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Notes:

- Some words like *comfortable*, *wonderful*, *quickly*, *breathless*, *tallest*, *worthless* have suffixes but no prefixes.
- Words like *unhappy*, *unkind*, *ungrateful*, *disappear*, *defrost*, *replay*, etc., have prefixes.
- The word tallest appears twice — likely a typo, but both entries are the same.

This exercise helps students understand how words are built from roots with prefixes and suffixes. Great practice for vocabulary and spelling!