I can't understand __________.A.what does Chrismas mean B.what Chrismas means.为什么不用A呢?怎么判断用不用助动词呢?比如说what do you mean为什么又要用助动词?

I can't understand __________.A.what does Chrismas mean B.what Chrismas means.为什么不用A呢?怎么判断用不用助动词呢?比如说what do you mean为什么又要用助动词?
I can't understand __________.A.what does Chrismas mean B.what Chrismas means.
为什么不用A呢?
怎么判断用不用助动词呢?比如说what do you mean为什么又要用助动词?

I can't understand __________.A.what does Chrismas mean B.what Chrismas means.为什么不用A呢?怎么判断用不用助动词呢?比如说what do you mean为什么又要用助动词?
前面有I can't understand ,
所以后面的就是句子后的成分,要用陈述句语序了
所以直接what Chrismas means.,而不是疑问句语序what does Chrismas mean .
如果没有前面的I can't understand ,就是what does Chrismas mean .需要助动词.