+Number is that modification of a noun or pronoun which denotes one thing or more than one+.
+The Singular Number denotes one thing+.
+The Plural Number denotes more than one thing+.
+RULE.—The plural of nouns is regularly formed by adding s to the singular+.
Write the plural of the following nouns.
Tree, bird, insect, cricket, grasshopper, wing, stick, stone, flower, meadow, pasture, grove, worm, bug, cow, eagle, hawk, wren, plough, shovel.
When a singular noun ends in the sound of s, x, z, sh, or ch, it is not easy to add the sound of s, so es is added to make another syllable.
Write the plural of the following nouns.
Guess, box, topaz, lash, birch, compass, fox, waltz, sash, bench, gas,
tax, adz, brush, arch.
Many nouns ending in o preceded by a consonant form the plural by adding es without increasing the number of syllables.