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

Task Explanation:

The task requires identifying the prefix, root word, and suffix of each given word. Not all words will have a prefix or suffix, so you need to analyze each word carefully.

Solution:

#### Definitions:
- Prefix: A group of letters added to the beginning of a root word to change its meaning.
- Root Word: The base part of a word that carries the primary meaning.
- Suffix: A group of letters added to the end of a root word to change its meaning or form.

#### Analysis of Each Word:

1. preheat
- Prefix: pre-
- Root Word: heat
- Suffix: None

2. unkind
- Prefix: un-
- Root Word: kind
- Suffix: None

3. undersea
- Prefix: under-
- Root Word: sea
- Suffix: None

4. submarine
- Prefix: sub-
- Root Word: marine
- Suffix: None

5. comfortable
- Prefix: None
- Root Word: comfort
- Suffix: -able

6. wonderful
- Prefix: None
- Root Word: wonder
- Suffix: -ful

7. defrost
- Prefix: de-
- Root Word: frost
- Suffix: None

8. overlook
- Prefix: over-
- Root Word: look
- Suffix: None

9. quickly
- Prefix: None
- Root Word: quick
- Suffix: -ly

10. breathless
- Prefix: None
- Root Word: breath
- Suffix: -less

11. tallest
- Prefix: None
- Root Word: tall
- Suffix: -est

12. worthless
- Prefix: None
- Root Word: worth
- Suffix: -less

13. replay
- Prefix: re-
- Root Word: play
- Suffix: None

14. ungrateful
- Prefix: un-
- Root Word: grateful
- Suffix: None

15. underground
- Prefix: under-
- Root Word: ground
- Suffix: None

16. tallest
- Prefix: None
- Root Word: tall
- Suffix: -est

17. unhappy
- Prefix: un-
- Root Word: happy
- Suffix: None

18. preschool
- Prefix: pre-
- Root Word: school
- Suffix: None

19. disappear
- Prefix: dis-
- Root Word: appear
- Suffix: None

Final Answer:

Here is the completed table:

| WORDS | PREFIX | ROOT WORD | SUFFIX |
|--------------|---------|-----------|----------|
| preheat | pre- | heat | None |
| unkind | un- | kind | None |
| undersea | under- | sea | None |
| submarine | sub- | marine | None |
| comfortable | None | comfort | -able |
| wonderful | None | wonder | -ful |
| defrost | de- | frost | None |
| overlook | over- | look | None |
| quickly | None | quick | -ly |
| breathless | None | breath | -less |
| tallest | None | tall | -est |
| worthless | None | worth | -less |
| replay | re- | play | None |
| ungrateful | un- | grateful | None |
| underground | under- | ground | None |
| tallest | None | tall | -est |
| unhappy | un- | happy | None |
| preschool | pre- | school | None |
| disappear | dis- | appear | None |

Explanation:

- For each word, I identified the prefix by looking for common prefixes like "pre-", "un-", "under-", etc.
- The root word was determined by removing any prefixes or suffixes and identifying the core meaning.
- The suffix was identified by looking for common endings like "-able", "-ful", "-less", "-est", "-ly", etc.

This method ensures accurate breakdowns of each word into its components.

Final Answer:
\boxed{
\begin{array}{|c|c|c|c|}
\hline
\text{WORDS} & \text{PREFIX} & \text{ROOT WORD} & \text{SUFFIX} \\
\hline
\text{preheat} & \text{pre-} & \text{heat} & \text{None} \\
\text{unkind} & \text{un-} & \text{kind} & \text{None} \\
\text{undersea} & \text{under-} & \text{sea} & \text{None} \\
\text{submarine} & \text{sub-} & \text{marine} & \text{None} \\
\text{comfortable} & \text{None} & \text{comfort} & \text{-able} \\
\text{wonderful} & \text{None} & \text{wonder} & \text{-ful} \\
\text{defrost} & \text{de-} & \text{frost} & \text{None} \\
\text{overlook} & \text{over-} & \text{look} & \text{None} \\
\text{quickly} & \text{None} & \text{quick} & \text{-ly} \\
\text{breathless} & \text{None} & \text{breath} & \text{-less} \\
\text{tallest} & \text{None} & \text{tall} & \text{-est} \\
\text{worthless} & \text{None} & \text{worth} & \text{-less} \\
\text{replay} & \text{re-} & \text{play} & \text{None} \\
\text{ungrateful} & \text{un-} & \text{grateful} & \text{None} \\
\text{underground} & \text{under-} & \text{ground} & \text{None} \\
\text{tallest} & \text{None} & \text{tall} & \text{-est} \\
\text{unhappy} & \text{un-} & \text{happy} & \text{None} \\
\text{preschool} & \text{pre-} & \text{school} & \text{None} \\
\text{disappear} & \text{dis-} & \text{appear} & \text{None} \\
\hline
\end{array}
}