1.This is a Chinese stamp.(改为否定句和一般疑问句）否定句：一般疑问句：2.These are Chinese stmps..(改为否定句和一般疑问句）否定句：一般疑问句：

1.This is a Chinese stamp.(改为否定句和一般疑问句）
否定句：There isn't a Chinese stamp.
一般疑问句：Is there a Chinese stamp?
2.These are Chinese stmps..(改为否定句和一般疑问句）
否定句：There aren't Chinese stamps.
一般疑问句：Are there Chinese stamps?

1.This is a Chinese stamp
否定句：There isn't a Chinese stamp.
一般疑问句：Is there a Chinese stamp?
2.These are Chinese stmps
否定句：There aren't Chinese stamps.
一般疑问句：Are there Chinese stamps?

我看了一下大家的答案，认为pf48跟我想的是一样的。
为什么大家都把 this is 和 these are 改为 is there 和 are there ？
现在的老师是这样教的吗？这跟我读书时学的印象中不一致啊。
？？？

This isn't a Chinese stamp
is this a Chinese stamp?
These aren't Chinese stmps
are there Chinese stmps?

1.This is a Chinese stamp.(改为否定句和一般疑问句）
否定句：There isn't a Chinese stamp.
一般疑问句：Is there a Chinese stamp?
2.These are Chinese stmps..(改为否定句和一般疑问句）
否定句：There aren't Chinese stamps.
一般疑问句：Are there Chinese stamps?
希望能够帮到楼主

1 This is not a Chinese stamp .否定句
Is this a Chinese stamp ?一般疑问句
2 These are not Chinese stamps .否定句
Are these Chinese stamps ?一般疑问句