商業書信通常都非常正式，要求表達一定要非常清晰，否則會給業務來往造成麻煩。下面是有關文法的tips，看看你有沒有犯同樣的錯誤喔!
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.應改為 deciding to rescind our earlier estimate, we have updated our report to include $40,000 for new equipment. (是we來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.應該連在一起.
3、對稱的結構比較容易讓人理解。例子： the owner questioned the occupant’s lease intentions a nd the fact that the contract had been altered with ink markings.應改為: the owner questioned the occupant’s lease intentions a nd ink alterations of the contract.
4、單複數不要搞亂，不然會好刺眼，看著不舒服。例如： an authorized person must show that they have security clearance.
5、動詞主詞要呼應。想想這兩個分別： 1). this is one of the public-relations functions that are under budgeted. 2). this is one of the public-relations functions, which are under budgeted.
6、時態和語氣不要轉變太多。看商務英語已經是苦事，不要浪費人家的精力埃
7、標點要準確。例如: he did not make repairs, however, he continued to monitor the equipment.改為: he did not make repairs; however, he continued to monitor the equipment.
8、選詞要正確，像affect和effect，operative和operational等等就要弄清楚才好用啦。
9、拼寫要正確，有電腦拼字檢查功能後，就更加不能偷懶。也許一筆好買賣就因為你的一個錯字飛掉了喔!
10、大小寫要注意。非必要不要整個字都是大寫，除非要罵人。例如: must change to os immediately.外國人就覺得不禮貌和喝令人一樣。要強調的話，用底線，斜字，粗體就可以了。