it is being a holiday.这句话对吗?如果对，is是系动词还是助动词？

it is being a holiday.这句话对吗?如果对，is是系动词还是助动词？
it is being a holiday.这句话对吗?
如果对，is是系动词还是助动词？

it is being a holiday.这句话对吗?如果对，is是系动词还是助动词？
首先这句话是正确的,is应该充当系动词!