Modal verbs.
How is right?
1. What I can do for you?
2. What can I do for you?
3. When I should come?
4. When should I come?
I think that 2 and 4 are correct, but I'm not sure.
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Answers · 2
2
Correct!
1 and 3 can be statements, 2 and 4 are questions.
2
This question is about the formation of questions, and not modal auxiliary verbs in particular. When a question begins with a question word, the usual structure is QUASM
1. QU Question word e.g. What
2. A Auxiliary e.g. can
3. S Subject e.g. I
4. M Main verb e.g. do
[then comes the rest of the sentence, in your case - for you]
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