写出下面单词的复数形式.
1.this ____________
2.that ____________
3.it ,he ,she _______
4.cousin__________
5.son______________
6.aunt _____________
7.frind ____________
8.grandparent________
9.brother _______
10.game________
11.thank________
12.ruler_________
13.photo________
14.clock________
15pencil________
16.phone________
17.box__________
18.family________
19.backpack_______
20.pen____________
1.these 2.those 3.othey 4.cousins 5.sons
6.aunts 7.friends 8.grandparents 9.brothers
10.games 11.thanks 12.rulers 13.families
19. backpacks 20.pens.