Question Formation Error Correction

It is wrong in standard written English because a direct present simple question with a main verb normally needs the auxiliary "do" or "does" before the subject. The correct form is "Where do you work?" For he, she, it, or a singular noun, use "does": "Where does your brother work?" A common learner mistake is copying the word order from a statement and relying on the question mark. In this error-correction route, punctuation is never enough. You need to check the grammar words that make the sentence a real English question.

First check the tense and subject. Use "do" for present simple questions with I, you, we, they, or plural nouns: "Do the shops open early?" Use "does" for he, she, it, or a singular noun: "Does the shop open early?" Use "did" for past simple questions: "Did the shop open early yesterday?" After all three auxiliaries, the main verb stays in the base form, so write "Does she like it?" not "Does she likes it?" This exercise trains both choices: the auxiliary and the verb form after it.

Some who and what questions are subject questions. That means the question word is doing the action, so you do not add "did": "Who called you?" and "What happened?" are correct. If the question word is the object, you usually need an auxiliary: "Who did you call?" The quick test is the answer. If the answer replaces the question word at the start, as in "Maya called me," it is a subject question. If the answer comes later, as in "I called Maya," use normal question order with do, does, or did.