am is he she it that this pen desk key orange boy parent mother father sister brother son daughtercousin case card的复数形式 请在8月29日之前回答
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)
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都是加s的,cousins,cases,cards.
am/is--are
he/she/it --they
that--those
this--these
desk--desks
orange--oranges
parent--parents
mother--mothers
father--fathers
sister--sistersbrother--brothers son--sons
daugter--daughters
cousin--cousins
case--cases
card--cards
cousins ,cases ,cards
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