Worksheet for practicing singular and plural nouns with fill-in-the-blank exercises.

The task is to convert singular nouns into their plural forms. Below is the completed table with explanations for each conversion:

Singular and Plural Nouns

| Singular | Plural | Singular | Plural |
|----------|--------------|---------------|---------------|
| 1. pen | pens | 11. butterfly | butterflies |
| 2. pencil| pencils | 12. photo | photos |
| 3. book | books | 13. video | videos |
| 4. chair | chairs | 14. hand | hands |
| 5. table | tables | 15. eye | eyes |
| 6. window| windows | 16. brush | brushes |
| 7. bed | beds | 17. peach | peaches |
| 8. shoe | shoes | 18. baby | babies |
| 9. bus | buses | 19. candy | candies |
| 10. box | boxes | 20. octopus | octopuses |

---

Explanation of Each Conversion:

#### Singular to Plural (Left Side)
1. pen → pens: Add "-s" to form the plural.
2. pencil → pencils: Add "-s" to form the plural.
3. book → books: Add "-s" to form the plural.
4. chair → chairs: Add "-s" to form the plural.
5. table → tables: Add "-s" to form the plural.
6. window → windows: Add "-s" to form the plural.
7. bed → beds: Add "-s" to form the plural.
8. shoe → shoes: Add "-s" to form the plural.
9. bus → buses: Add "-es" because "bus" ends in "-s".
10. box → boxes: Add "-es" because "box" ends in "-x".

#### Singular to Plural (Right Side)
11. butterfly → butterflies: Add "-ies" because the word ends in "-y" preceded by a consonant.
12. photo → photos: Add "-s" to form the plural.
13. video → videos: Add "-s" to form the plural.
14. hand → hands: Add "-s" to form the plural.
15. eye → eyes: Add "-s" to form the plural.
16. brush → brushes: Add "-es" because the word ends in "-sh".
17. peach → peaches: Add "-es" because the word ends in "-ch".
18. baby → babies: Change "-y" to "-ies" because the word ends in "-y" preceded by a consonant.
19. candy → candies: Add "-ies" because the word ends in "-y" preceded by a consonant.
20. octopus → octopuses: Add "-es" (though some use "octopi" as a Latin-derived plural, "octopuses" is more common in English).

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Final Answer:

\boxed{
\begin{array}{|c|c||c|c|}
\hline
\text{Singular} & \text{Plural} & \text{Singular} & \text{Plural} \\
\hline
1. \text{pen} & \text{pens} & 11. \text{butterfly} & \text{butterflies} \\
2. \text{pencil} & \text{pencils} & 12. \text{photo} & \text{photos} \\
3. \text{book} & \text{books} & 13. \text{video} & \text{videos} \\
4. \text{chair} & \text{chairs} & 14. \text{hand} & \text{hands} \\
5. \text{table} & \text{tables} & 15. \text{eye} & \text{eyes} \\
6. \text{window} & \text{windows} & 16. \text{brush} & \text{brushes} \\
7. \text{bed} & \text{beds} & 17. \text{peach} & \text{peaches} \\
8. \text{shoe} & \text{shoes} & 18. \text{baby} & \text{babies} \\
9. \text{bus} & \text{buses} & 19. \text{candy} & \text{candies} \\
10. \text{box} & \text{boxes} & 20. \text{octopus} & \text{octopuses} \\
\hline
\end{array}
}