商业书信通常都非常正式，要求表达一定要非常清晰，否则会给业务来往造成麻烦。下面是有关文法的tips，看看你有没有犯同样的错误哦！
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. (是We 来decide, 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. 应该连在一起.
3、对称的结构比较容易让人理解。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、 单复数不要搞乱，不然会好刺眼，看着不舒服。例如： An authorized person must show that they have security clearance.