I would be appreciate if you could let me know this week.	I would appreciate it if you could let me know this week.	
I am interest in receive details of your Japanese courses.	I am interested in receiving details of your Japanese courses.	
I have received your letter on 14 February.	I received your letter on 14 February.	
Thank you for agree to give a presentation to our
management team.	Thank you for agreeing to give a presentation to our management team.	
I am grateful if you will reply as soon as possible.	I would be grateful if you would/could reply as soon as possible.	
I am regret we do not stock the item you require.	I regret we do not stock the item you require.	
Please kindly return the coupon as soon as possible.	Please return the coupon as soon as possible.	
Refer the captioned meeting on Monday, this has now been postponed until 12 April.	Monday’s meeting has now been postponed until 12 April.	
Please do not hesitate to contact me if you have any question.	Please do not hesitate to contact me if you have any questions.	
I am writing for enquiring about your office cleaning services.	I am writing to enquire about your office cleaning services.	
Further our meeting last week. I am pleased to tell you that we are now ready to place an order.	Further to our meeting last week, I am pleased to tell you that we are now ready to place an order.	
Thank you for your letter regard the building work at 103 Queen’s Road.	Thank you for your letter regarding the building work at 103 Queen’s Road.	
For the price, this depends on the quantity ordered.	As for the price, this depends on the quantity ordered.	
Dear Sirs,	Dear Sir or Madam,	
Would you mind to give me a call this week?	Would you mind giving me a call this week?