Here are some of the most common errors when asking questions using the present simple verb tense, preceded by their correct form:
What do you eat for breakfast every day?
What you eat for breakfast every day?
What are you eat for breakfast every day?
To ask questions with I, you, we, they, use the question form do in the following order:
DO + SUBJECT (I, YOU, WE, THEY) + BASIC VERB FORM
The basic verb form is the verb without 'to:' (to) play, (to) watch, etc.
What does your husband eat for breakfast every day?
What your husband eats for breakfast every day?
What do your husband eats for breakfast every day?
What does your husband eats for breakfast every day?
To ask questions with a noun or a 3rd person pronoun (he, she it), use the question form does in the following order:
DOES + SUBJECT (NOUN, HE, SHE, IT) + BASIC VERB FORM
Don't you eat breakfast?
Do you not eat breakfast? (less common)
You not eat breakfast?
Do you don't eat breakfast?
Do your brothers and sisters eat breakfast?
Your brothers and sisters, do they eat breakfast?
This form is not incorrect if you mean: "(What about) your brothers and sisters? Do THEY eat breakfast?
Who eats breakfast in your family?
How many people smoke in your family?
Who does eat breakfast in your family?
This form is not incorrect if you mean: "Is there anyone at all who eats breakfast in your family? In most cases, however, it is wrong. Follow the rule below:
Do not use the question forms (do/does) when the question word is the subject of the sentence.
Can you come tomorrow?
Should we leave a tip?
Do you can come tomorrow?
Do not use the question forms (do/does) with modal verbs (can, must, may, should, might).