Whatever your industry or profession, advancing your career up the corporate ladder is challenging.

For those business professionals for whom English is not their first language, there may be an additional challenge – communicating in written and oral English. It is expected that, at an executive level, you are able to speak with the fluency and the nuances expected of a native English speaker. This is a tall order, and entirely possible, if you want it.

As you move up the corporate ladder, expectations around your oral and written communication skills change and shift. In many cases, the expectation is that you can communicate in English fluently and spontaneously, without any difficulty making yourself understood. This is especially true when your career path includes managing people, clients, or large projects. You will need to take additional care and attention when refining your English fluency, as you rise up the corporate ladder.

As a person for whom English is not their first language, there are common grammatical mistakes that can lead to your being misunderstood by colleagues.

Here are the top two most common grammar mistakes a business professional might make when communicating at work.