Usage of 'USED TO' : part 2.different than existing question [duplicate]

Question

Another question about used to does exist here. But this question is slightly different. It concerns with two types.

Which is more appropriate?

First, doing or do?

Second, were or did?

Which of the following types of usage is/are correct?

----Were you used to doing this

or----Were you used to do this?

----Did you use to....

or ---Were you used to... (as above)

Please give a detailed explanation.