This grammar worksheet challenges students to write the plural forms for sixteen singular nouns, covering rules for words ending in 'o', 'y', and 'f'.

To solve this task, we need to change each singular noun into its plural form. Most nouns simply add an "s" at the end, but some have special rules depending on how they end (like words ending in "sh", "x", "y", or "fe").

Here is the step-by-step breakdown:

1. chair: This is a regular noun. We just add "s". -> chairs
2. potato: Nouns ending in "o" usually add "es". -> potatoes
3. bench: Nouns ending in "ch" add "es" to make them easier to say. -> benches
4. kite: A regular noun ending in a vowel + consonant. Just add "s". -> kites
5. box: Nouns ending in "x" add "es". -> boxes
6. dish: Nouns ending in "sh" add "es". -> dishes
7. fly: Nouns ending in a consonant + "y" change the "y" to "i" and add "es". -> flies
8. tray: Nouns ending in a vowel + "y" just add "s". -> trays
9. knife: Nouns ending in "fe" usually change the "fe" to "ves". -> knives
10. dog: A regular noun. Just add "s". -> dogs
11. wolf: Nouns ending in "f" often change the "f" to "ves". -> wolves
12. glass: Nouns ending in "s" add "es". -> glasses
13. baby: Ends in consonant + "y". Change "y" to "i" and add "es". -> babies
14. wish: Ends in "sh". Add "es". -> wishes
15. child: This is an irregular noun. It changes completely. -> children
16. fox: Ends in "x". Add "es". -> foxes

Final Answer:
1) chairs
2) potatoes
3) benches
4) kites
5) boxes
6) dishes
7) flies
8) trays
9) knives
10) dogs
11) wolves
12) glasses
13) babies
14) wishes
15) children
16) foxes