Welcome to the forum, Roma.
In statements, the verb normally follows the the subject:
The time is 7 o'clock.
Fred lives in Prague,
In direct questions, subject-verb word order is reversed: What is the time?
If there is no auxiliary verb, DO is used in the direct question: Where does Fred live?
In indirect questions, we use statement word order, and do not use a question mark:
I have no idea what the time is.
I don't know where Fred lives.
If the indirect question is contained within a direct question, that question will require a question mark:
Do you know what the time is?
Can you tell me where Fred lives?
Student or Learner