this is a box.變複數句___________？

these are boxes

RELATED INFORMATIONS

1. This is a pen and that is a knife改為複數形式
2. This book is in that box.（改為複數形式）
3. this is knife in the box（變複數句
4. 把下列句子由單數變為複數或由複數變為單數.1、This is a book.2、That is a box. 3、Are those rulers？4、What are these.5、They are toys
5. This is my dress.改成複數句.
6. This dress is pretty.（改為複數句）
7. is this your dress？改為複數句
8. This dress is orange.（改複數句）
9. This is a tomato.（改為複數）適當形式填空 His joke madeevery（laugh） It's seven o'clocknow.TheBlacks（have）breakfast. Please be（quiet）in the library and read（quiet） The door is（open），buy nobody is in the room our（反義詞）twelfth（基數詞）
10. is this your tomato？（改為複數形式）
11. is this that變複數怎麼變
12. This is aman.Thatis a woman改為複數形式快，很急，現在就要
13. This is her watch.[變複數】
14. 把下列句子變成複數形式.This is a watch.
15. 1、This is a watermelon .2、It is a yellow shirt.3/That '；s my watch.變為複數怎麼變
16. Is this a watch？（複數）
17. this is a watch（改為複數句）
18. 根據要求改寫單詞：1、heavy（反義詞）---；2、this（複數）---3、knows（同音詞）---）
19. don't的原形（）this的反義詞（）foot的複數
20. these（反義詞）it（複數形式）that（複數形式）photo（複數形式）picture（複數形式）