The phrase "about the case you asked me to do" is grammatically correct and can be used in written English.It is typically used when discussing a specific task or assignment that someone has asked you to complete. Example: "About the case you asked me to do, I have finished the research and will be presenting my findings at the meeting tomorrow."
As they walked away I asked "Don't you want to know who I am, in case the boss wants to ask me about my phone".
I generally describe them about the complex case and ask them what they would do".
Mr. Boies looked confused when asked about the case and did not seem to recognize his client's name.
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The Williams case asks the question, When does teaching about religion become proselytizing?
In this case, the authors ask, how do contemporary representations of the Middle Ages influence cultural fantasies about our own time?
Ask about cleaning instructions and what to do in case of damage.
Ask friends about what to do.
This information item asked patients if someone informed them about what to do in case of an emergency after the cataract operation.
How do you go about doing this, you ask?
Don't ask me about these words".
Don't ask me about valuation.
I asked you if you didn't talk to him a day or two ago about your testimony in this case?
Ask the vendor about the return policy, in case you change your mind about the purchase, or your bride to be does not like the ring you buy.
In case the couple does ask you, you can then be truthful about the date just not being convenient.