写出下列单词的复数形式,1.bus 2.that 3.knife 4.it 5.this 6.I 7.pencil-box 8.man 9.woman 9.fly
问题描述：
写出下列单词的复数形式,1.bus 2.that 3.knife 4.it 5.this 6.I 7.pencil-box 8.man 9.woman 9.fly
答
1 buses
2 those
3 knives
4 they
5 these
6 we
7 pencil-boxes
8 men
9 women
10 flies