Elephants have their own way to tell the shape of an object and whether it is rough or smooth.如果whether it is rough or smooth.是宾语从句的话那主语和谓语是什么?

Elephants have their own way to tell the shape of an object and whether it is rough or smooth.如果whether it is rough or smooth.是宾语从句的话那主语和谓语是什么?
Elephants have their own way to tell the shape of an object and whether it is rough or smooth.
如果whether it is rough or smooth.是宾语从句的话那主语和谓语是什么?

Elephants have their own way to tell the shape of an object and whether it is rough or smooth.如果whether it is rough or smooth.是宾语从句的话那主语和谓语是什么?
whether it is rough or smooth.是动词tell的宾语从句
whether 引导词 it主语 is系动词 rough表语 or连接词 smooth表语
若粗线条划分的话,是：whether 引导词 it 主语 is rough or smooth谓语

have是位于，to之后的是修饰成分

whether it is rough or smooth 是宾语从句，在这个从句中，it是主语，指代前面提到过的object, 注意不是elephants, is 是系动词，rough or smooth 则是表语。