$\text{Give the plural of the nouns, then put them in the right column:}$
$\text{Book → ..books....}$
$\text{Box → ...boxes..}$
$\text{Money → ..money...}$
$\text{board → ...boards..}$
$\text{Garden → ..gardens...}$
$\text{/iz/: boxes}$
$\text{/z/: gardens}$
$\text{/s/: books, boards}$