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Hi

When do you usually use these words, and what is the rule...?

--- I'm just curious why can't I say: "..... and what the rule IS...?" I suppose the second part of the sentence is a sort of separate sentence and that's why I have to say: what is the rule? instead of "what the rule is?"
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You have not supplied enough information or context to explain your problem, but this is right:

I'm just curious why I can't say "What is the rule?"
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Mister Micawber.
You have not supplied enough information or context to explain your problem, but this is right:

The whole sentence says: When do you usually use these words, and what is the rule for using them?

At the beginning there is a question: When do you..... and then again there is a question and what is....

At first I thought that it should be: When do you usually use these words, and what the rule for using them is? But now I know it's incorrect Emotion: smile
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Ah. This is a compound sentence: two independent clauses, and each of them is a question:

When do you usually use these words? (and) What is the rule for using them?
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