Is that an orange的复数形式是什么？

还有吧What are these？和 They are English buses改成单数句

Is that an orange
复数形式：Are those oranges？

What are these？
单升戚数句：What is this?

They are English buses.

单数升租句:This is an English bus.

如有疑问，敬请吵笑陵追问

Are those oranges?
what is this?
that is English bus