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Indirect Requests and Information Exchange
Tell someone to do something
Tell someone some information
Ask someone to do something
Ask someone for some information (Yes or No)
Ask Paula if she is coming to the party.
Could you ask them if they did the homework?
Please ask her whether she finished the assignment.
Ask someone for some information (Open ended)
Ask Randy what he is doing.
Please ask her when she will be here.
Would you ask him what he wants?
Will you ask them how much it costs?
See also:
Grammar: Noun Clauses