比较formal和informal两种不同的说法，二者皆可商用，不过后者是对同事和老顾客使用的。
| FORMAL: |
I am writing to enquire about your Report Writing workshop. |
| INFORMAL: |
I'm writing to ask about your Report Writing workshop. |
| FORMAL: |
This is due to the fact that one of our staff was sick. |
| INFORMAL: |
This is because one of our staff was sick. |
| FORMAL: |
If you require any further information, please contact me. |
| INFORMAL: |
If you need any more information, please call me. |
| FORMAL: |
I regret to advise you that there have been some problems. |
| INFORMAL: |
I'm sorry to say there have been some problems. |
| FORMAL: |
Unfortunately, I have to inform you that I will not be able to attend the workshop. |
| INFORMAL: |
Unfortunately, I have to let you know I won't be able to go to the workshop. |
| FORMAL: |
I am sending a copy of the report under separate cover. |
| INFORMAL: |
I'm sending a copy of the report separately. |
| FORMAL: |
Please find enclosed our proposal. |
| INFORMAL: |
I've enclosed our proposal. |
| FORMAL: |
We have been forced to postpone the project. |
| INFORMAL: |
We must postpone the project. |
| FORMAL: |
Here is a cheque in your favour. |
| INFORMAL: |
Here's a cheque for you. |
