4.12 position of auxiliary verbs

In a 'yes/no'-question, if there is an auxiliary verb, the auxiliary verb comes first, followed by the subject, then the main verb.

If there is more than one auxiliary verb, the first auxiliary verb comes at the beginning of the clause, followed by the subject, followed by the other verbs.

4.13

If there is no other auxiliary verb, you put 'do', 'does', or 'did' at the beginning of the clause, in front of the subject.

Note that if the main verb is 'do', you still put 'do', 'does', or 'did' at the beginning of the clause, in front of the subject.