将下列句子单复数互变this is a pencil-box.Is that an orange?He is an En

these are pencil-boxesare those oranges?they are english childrenthey aren't teachersthose are bagsare they your pens?these aren't my desksit is an eraserwhere is the apple?is that your bike?yes,it is

one tip:
要想别人给你做这么低级的苦力，至少悬赏给出来。

1 These are pencil-boxes.
2 Are those oranges？
3 They are English children.
4 They aren't teachers.
5 Those are bags.
6 Are they your pens？
7 These aren't my/our desks.
8 It is his/her eraser.
9 Where is the apple？
10 Is that your bike? Yes, it is.