商务英语是英语中的一个分支，主要运用在商业性的职场中。商务英语的本质就是英语，是一种语言，所以它的运用也体现在听、说、读、写四个方面。而在商业活动中，除了平时的听、说的直接交流，使用商业信函进行沟通交流也是职场人学习商务英语的重要原因。
商业信函有其自身的特点。其中用商务英语书写书信有几点注意事项。
1.切忌主客不分或模糊。例子： Deciding to rescind the earlier estimate,our report was updated to include $40,000 for new equipment.应改为 Deciding to rescind our earlier estimate,we have updated our report to include $40,000 for new equipment. (主语应该是We而不是report.)
2.句子不要零碎。例子： He decided not to audit the last ten contracts. Because of our previous objections about compliance. 两个句子应该连在一起：He decided not to audit the last ten contracts because of our previous objections about compliance.
3.结构对称，令人容易理解。例子： The owner questioned the occupant's lease intentions and the fact that the contract had been altered with ink markings. 应改为： The owner questioned the occupant's lease intentions and ink alterations of the contract.
4.单复数不能搞错。例如： An authorized person must show that they have security clearance. 应改为 Authorized persons must show that they have security clearance.
5.动词和主语要呼应。观察下面两个句子的分别： 1. This is one of the public-relations functions that is under-budgeted. 2. This is one of the public-relations functions,which are under-budgeted.
6.标点要准确。例如： He did not make repairs,however,he continued to monitor the equipment. 应改为： He did not make repairs; however,he continued to monitor the equipment.标点要特别注意，因为英语标点和中文标点还是存在很大差异的。
7.选词合适、正确。像affect和effect，operative和operational等等就要辨析清楚。
8.拼写正确。现在已经不用人工检查了，可以直接使用电脑拼字检查功能。
9.大小写要注意。除非必要不要整个词都大写，除非要骂人。例如： MUST change to OS immediately. 外国人就觉得不礼貌和喝令人一样。要强调的话，用底线，斜字，粗体就可以了。
英语是一项外语，使用习惯、文化和我们中文存在很大差异，所以在使用时要稍微思考一下。特别是写商业信函，因为中间存在时间差，小伙伴们可以好好对自己写的东西进行检查润色，以期望向对方呈现最完美的一面。夸张点说，商业信函分分钟关系到小伙伴甚至加薪，走上人生高峰啊，我们需要慎之又慎！