Question

some one is knocking at the door question tag​

Answer 1

Answer:

so when you use somebody or everybody, you can refer to them as 'they'. thus the correct tag question is: somebody has knocked at the door, haven't they? there are some exceptions in tag questions where the auxiliary in the first clause doesn't match the one in the tag.

Explanation:

I hope it will help you if it then mark as brainlliest.

Answer 2

Answer:

Is someone knok the door?

if there is any problem then ask it