How to be an effective communicator and public speaker ?

I am not here to teach English grammar. We are into business. What does that mean? We are busy; we want to get more jobs done in less time. But sometimes, the way we communicate, we dig our own grave by prolonging the communication with negative output. Grammatically you may be perfect, but that does not mean anything to us unless you are getting the desired result. Though the fault is in every one of us, but no one likes to be blamed, accused and commanded by others. If I can communicate without blaming, accusing and commanding others, I can achieve better results in both personal and professional life. It’s not what I communicate but how I communicate plays the major role in every relationship.  Replace 'YOU' with 'I', whenever you want to express your feeling. If you suppress your emotions by not expressing the truth, you are inviting 'Psychosomatic illness' in the long run. You can use this key in any language. There is no barrier to express your feeling, replace 'you' with 'I' and observe the response from the other person.