Japanese phrase
___までに返事をください。 ___ ma de ni hen ji o ku da sa i
Meaning
Please get back to me by ___.
When to use it
Asks someone to respond by a stated deadline. The wording is natural and polite in everyday requests, especially when a decision or confirmation is needed.
Example dialogue
参加できるか、明日までに返事をください。 san ka de ki ru ka asu ma de ni hen ji o ku da sa i
Please get back to me by tomorrow about whether you can attend.
はい、明日中に返事します。 ha i myō nichi chū ni hen ji shi ma su
Yes, I will reply by tomorrow.