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I always tend to use constructions like in the examples below. Where I'm mixing "do" and "be" by way similar to that when the "do" and "have" are used together. (e.g. Does it have?). Why it is wrong? How it break the sense of what I want to say by it?

a) Does the feature is still available?

b) Do markets are open?

Thank you.

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    Both of your examples are wrong. It would rather be "Is the feature still available?" and "Are the markets open?". Try putting correct examples so your question can be understood more easily – Bella Swan Apr 3 at 5:04
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You can form sentences that use either do or is, but generally not both at the same time. As a simple rule, pick only one or the other:

✘ Does the feature is still available?

→ ✔ Is the feature still available?
→ ✔ Does the feature still exist?

With the does version, you can't use the word available, so I changed it to something else.

✘ Do markets are open?

→ ✔ Are the markets open [now]?
→ ✔ Do the markets open [at 9:00]?

I added the definite article in front of feature. I also added the words in parentheses to illustrate the different meanings of the two sentences.

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To do and to be never mix in the same clause / sentence. Either of them is enough, depending on the context.

Your examples will be OK like this:

a) Is the feature still available?

b) Are the markets open?

If your question must use to be, then to do is no longer needed.

However, if your sentence does not have / does not need to be, then to do is needed:

Do you have some time?

Did you go to the concert?


Additionally,never mix to do with the modal verbs: can / may / must:

Do you can sing?

Can you sing?>

or:

Do I may wait here?

May I wait here?

To form an interrogation with must, then you need to use to have to, and therefore use to do:

Do I must pay?

Do I have to pay?

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