书信建议信道歉信抱怨信感谢信邀请信段一，写信原因making a suggestion / making a request / maiking an apology 段二，说明对方做了什么并对自己产生了什么影响、带来了什么等段三，提出自己希望的效果、方案、建议等，并细化段四，希望尽快得到回音建议Dear Sir/Madam:I am delighted to learn that your library is taking steps to upgrade its equipment and I am writing this letter to offer some sugestions. As is known to all i this neighborhood, your library has not only been helpful for th local students, but also plays an important role in the work and leisure of the local professionals. Therefore, your library shold be equipped with a wide range of electronic devices and facilities, including .(projectors, reording equipment,video collections and multi-media rooms)More computers with access to the internet should also be available in your library. To my great disapoointment, only one computer in your library has internet access. This situation should be changed immediately, otherwise more local residents would end up feeling disappointed with this library.I would be grateful indeed if you can take my proposals into serious consideration. 落款yours sincerely +name 抱怨I am writing to complain about a product made by your .A few months ago I purchased a .by .After a few weeks I found that it had seriously damaged .Now I want to ask you to change .I am quite annoyed by the facy that sometimes when I .Please change .for .that will not .Otherwise, I would ask you to give my money back, or I would complain to the Consumers Association. Im writing to bring to your attention the unprofessional attitude of one of the members of your staff Im sorry to inform you that .I m writing to express my dissatisfaction with .(人，事，物）I would like to suggest that .It seems to me that you could .I am very glad to hear that ., so I am writing this letter to offer my suggestions. I would really appreciate it if you take my proposals into serious consideration.