把下列句子变为复数
问题描述：
把下列句子变为复数
This is a watermlon.
it is a yellow shirt.
that's my watch.
答
1、This is a watermlon.
These are some watermelons.
这些是西瓜.
2、It is a yellow shirt.
They are some yellow shirts.
它们是些黄色衬衫.
3、That's my watch.
Those are our watches.
那些是我们的手表.