Which is correct:
- Please let me know when WILL YOU go.
- Please let me know when YOU WILL go.
- I don't know when would he arrive.
- I don't know when he would arrive.
Please explain why. Thanks! :)
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"Order of words in an interrogative sentence is as follows:
Verb + subject + ............................?
When will ( Verb ) you ( subject ) come ?..-"
However, If you said it either way, any English speaker would understand you and it would be correct.
Edit: The second one of both personally sounds better to me, however I believe above is the correct way to structure it.
A feature of direct questions in English is that the subject and verb are inverted. So statements such as "I am" and "I will go" become "Am I?" and "Will I go?". If there is no auxiliary verb in the statement, a dummy verb "do" must be added to the statement prior to inversion: "I go" --> "I do go" --> "Do I go?".
Interrogatives added to the start retain this inverted order: "Who am I?", "When will I go?". The exception is if where the interrogative is a subject pronoun. So, whereas we say "Who(m) did I kiss?" (because "who(m)" is an object pronoun), we say "Who kissed me?" (because "who" is a subject pronoun directly replacing the name of the person who performed the action).
As a direct question, we say "When will you go?" and "When would he arrive?".
Occasionally, we express a question simply through a rising intonation, without changing the word order. So "I am?" and "He went there?" can be questions. The non-inverted form of "When will you go?", however, wouldn't be "When you will go?". Rather, it would be "You will go when?". Similarly, "He would arrive when?".
As indirect questions embedded in subordinate clauses, there is no inversion of subject and verb. So "I don't know when you will go"; "I asked when he would arrive"; "Please let me know when you will go".
Please let me know when WILL YOU go.
Wrong - because you have inverted the subject and verb, which is invalid here for the reasons explained above. This could only work as two separate sentences: "Please let me know - when will you go?".
Please let me know when YOU WILL go.
I don't know when would he arrive.
Wrong - the subject and verb in the subordinate clause have been inverted, which they shouldn't be here. It could only work as two sentences: "I don't know. When would he arrive?".
I don't know when he would arrive.