To whom may concern how to say ‘no’ or refuse to do something. Then we can use or show it in any polite way to avoid your awkward feeling or something else.People in communication, is not always but usually at some time they still have to say ‘no’, but how to say it and then cannot make others unhappy? In English, it can be so politely to refuse and you can apply in the following ways. I can’t right now, but maybe later. នៅពេលនេះខ្ញុំមិនអាចដកដៃបានទេ សូមចាំបន្តិចទៀតចុះណា៎! (ចាំលើកក្រោយចុះ)It means that it might be able to do it in the future, but now it cannot. Sorry but that isn’t my strong suit. សុំទោសផង ខ្ញុំមិនមានសមត្ថភាពលើការងារខាងផ្នែកនេះទេ។To show you are not good at the point others asking for help. I’m sure you will do fine on your own. ខ្ញុំជឿជាក់ថាអ្នកអាចធ្វើវាបានដោយសមត្ថភាពផ្ទាល់ខ្លួនឯង។It is a polite way to tell people to do their own tasks by themselves rather than to ask another for help. I’m afraid I’m committed to something else. ខ្ញុំដូចជានៅមានការងារផ្ទាល់ខ្លួនផ្សេងទៀតត្រូវធ្វើ។You can say like this if you have another plan to do. I’m sorry, but I have an emergency to attend to. ឲ្យខ្ញុំសុំទោសផង ខ្ញុំមានធុរៈបន្ទាន់ត្រូវទៅបំពេញ។In this way, since you have some urgent tasks to do then rarely be able to hand on others’ business.Thank you for reading and any comments for improvement.Sivann