5 Rules for Spelling Plural Nouns
Many are simple; some are more difficult. Some...well...
Simple.
1.  Add an "s:
 car + s = cars 
 house + s = houses

With sounds...
2. After ssssss sound, add "es:"
class + es = classes
glass + es = classes
box + es = boxes

3. OK...now don't laugh. After "f" sound, change "f" to "v" and add "es":
    
half   halv + es = halves  (And then, you pronounce like "haves." (LOL)(This does not work of course, with the word "laugh.")
  
      3.1 If the last "f" sound has a silent "e" then change "f" to "v" and add "s":
          
life    live + s = lives

4. Nouns ending with "y" after a vowel it's simple. Add "s":
       
boy + s = boys     day + s = days

    4.1 Nouns ending with a "y" after a consonant: Change the "y" to "i" and add"es." That's right. Don't cry....
      
country    countr (change "y" to "i") + i + es = countries
       family    famil (change "y" to "i") + i + es = families
       This also works with the word "cry" ("cries.")

5. "Man" changes to "men"; also in workman (workmen) and woman (women). (Strangely, we pronounce "Woman" as "wimmen" -- with no rule or reason we use in any other word.)

6. This last one isn't a rule: Just remember "child" becomes "children" and "fish" doesn't change at all! Had enough?

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GrammarTech™

Consonant: the other sounds languages have, they are the consonants:   b,c,d,f,g,h,j,k,l,m,n,p,q,r,s,t,   (Up)

Pronounce: the action of pronunciation   (Up)

Silent: without any sound    (Up)

Vowel: one of the sounds languages have, they are the vowels: a,e,i,o,u    (Up)