Could you please advise us if…?
Could you please advise us if the product we ordered have been shipped?
Could you please advise us if you have completed the requested proposal?
It would be greatly appreciated if…
It would be greatly appreciated if you could send the payment within this week.
It would be greatly appreciated if we can have your thoughts about this sooner.
Would it be possible for you…?
Would it be possible for you to send us the signed quotation today?
Would it be possible for you to confirm the meeting date sooner?
It has been…since…
It has been several weeks since we have sent you our first invoice and we have not yet received your payment.
It has been two weeks since I have asked you to send me the report.
You must take immediate action to…
You must take immediate action to deal with this problem.
We urge you to…
We urge you to give your prompt attention to this matter.
We urge you to ship the goods within this week.