suffixes

empty-empties
monkey-monkeys
security-securities
holiday-holidays
pity-pities
friendly-i don't know this one
strawberry-strawberries
delay-delays
birthday-birthdays
say-says
vocabulary-vocabularies
conspiracy-conspiracies
memory-memories
candy-candys
story-stories
handy-handyness
envy-don't know this one
library-libraries

friendly -- friendlier, friendliness

candy -- candies (follows the rule to change the y to i and add -es)

handy -- handiness

envy -- envies (follows the rule to change the y to i and add -es)

The rest are correct. :-)

friendliness, candied or candies, handiness, envied or envies

it may help to use a dictionary if you are unsure of a word. They provide suffixes. :)

To determine the correct suffix for the words "friendly" and "envy," we need to understand the general rules for forming plural nouns with different suffixes.

1. Adding "-s" or "-es": Most singular nouns can be made plural by adding "-s" or "-es" at the end.

- For example, "empty" becomes "empties" by adding "-es," and "monkey" becomes "monkeys" by adding "-s."

2. Adding "-ies" or "-ys": When a singular noun ends in a consonant followed by a "y," the "y" is changed to "i" and "es" is added.

- For example, "pity" becomes "pities" by changing "y" to "i" and adding "-es."

3. No change: Some singular nouns do not undergo any changes when made plural.

- For example, "holiday" remains "holidays" by adding "-s," and "birthday" becomes "birthdays" by adding "-s."

4. Irregular plurals: Certain words have irregular plural forms that do not follow the typical rules.

- For example, "say" becomes "says" by adding "-s," and "delay" becomes "delays" by adding "-s."

Now let's determine the plurals for "friendly" and "envy":

- "Friendly": Since "friendly" ends in a "y" preceded by a vowel, the general rule is to add "-s." Therefore, "friendly" becomes "friendlys." However, "friendlys" is not a standard plural form. The correct form is "friendlies." So, "friendly" becomes "friendlies."

- "Envy": Unfortunately, "envy" is an irregular noun and doesn't follow the typical rules for pluralization. The plural form of "envy" remains "envies."

So, the correct plural forms are:
- "Friendly" → "Friendlies"
- "Envy" → "Envies"