am is he she it that this pen desk key orange boy parent mother father sister brother son daughter
问题描述：
am is he she it that this pen desk key orange boy parent mother father sister brother son daughter
cousin case card的复数形式
请在8月29日之前回答
答
am (are) is (are) he,she,it (they) that (those) this (these)
pen (pens) desk (desks) key (keys) orange (oranges) boy (boys)
parent (parents) mother (mothers) father (fathers) sister (sisters)
brother (brothers) son (sons) daughter (daughters) cousin (cousins)
case (cases) card (card)