Student or Learner
1)Do all the above sentences have the same meaning?
2)Are all the above sentences have the same meaning? This one is incorrect.
Is the 2nd sentence is incorrect because I have used "have"? (please clarify). Whether it means with do we can use "have" and not with are.
If I write Are all the above sentences correct? ( I understand this is correct)
The following may be helpful to you.
http://www.ego4u.com/en/cram-up/grammar/auxiliary-verbs Scroll down to 'The auxiliary "do" in questions'.
Not a teacher.