名词变复数和动词的三单形式可不一定都发S这个音，也可能发Z这个音。下面小编带大家一起来区分一下，看图。（主要是为了刺激你的荷尔蒙，提升你的记忆力，理解力）
Rule 1
If a word ends in a sound that is unvoiced (such as P, T, K, F), you add an unvoiced /S/
Examples:
1 cup, 2 cups (the p in cup is unvoiced, so you just add an unvoiced s)
1 cat, 2 cats (the t in cat is unvoiced, so just add an unvoiced s)
Rule 2
If a word ends in any of these sounds: s, z, sh, ch, or dg (j), when adding an S ending, addIZZZZZZ
Examples:
1 Page 2 Pages
1 Bus 2 Buses
1 Lunch 2 Lunches
I Raise, He Raises
I Brush, He Brushes
I Push, He Pushes
Rule 3
If a word ends in a vowel sound (like the word Tree) or a voiced consonant (like the word Game), then when you add an S, continue the voicing throughout the entire word, and it should become a voiced ZZZZ.
Examples:
1 Tree, 2 Treezzzz (correctly spelled Trees)
1 Day, 2 Days
1 Shoe, 2 Shoes
I Fly, He Flies
1 Game, 2 Games
1 Head, 2 Heads
1 Train, 2 Trains
1 Song, 2 Songs
Some common words where S’s are pronounced as Z’s
IS
HIS
AS
WAS
THESE
THOSE
EASY
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