Three rules for S&Z endings (30:11-38:27) （下面的多个Z是Paul为了强调z音而使用的夸张表示法）
Rule 1
If the last sound in a word is unvoiced, and you’re adding an S, well, then the S remains unvoiced, too.
Examples:
1 cup, 2 cups (the p in cup is unvoiced, so you just add an unvoiced s)
I break, he breaks
Rule 2
If a word ends in any of these sounds: s, z, sh, ch, or dg (j), when adding an S ending, add IZZZZZZ
Examples:
1 Page 2 Pages
I Raise, He Raises
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
I Fly, He Flies
