Definition: a word or form which expresses more than one Level: A2
'child' 的复数是 'children'。
"Children" is the ___plural of "child."
'tooth' 的复数形式是 'teeth'。
The ___plural form of "tooth" is "teeth."
要构成复数，你通常在一个词的末尾加 -s。
To form the ___plural, you usually add -s to the end of a word.
