"Just as the words that all of us long to hear like, 'I love you' or 'Please be mine' tend to be grouped in threes, the words that we never want to hear are invariably grouped in fours. Words that say things like, 'I don't love you....You will die soon....I found someone else.....You can't have children.... let's just be friends....I never loved you....etc.'
Ever since time began, there have always been occasions when so much hung upon the difference that a single word can make like yes or no, will or won't, could or can't. Either adding or subtracting a word can also make a considerable difference to the happiness of another or their sense of importance.
So if you want to make a difference to the next person who comes knocking on your door, upon meeting them don't just politely say, 'Can I help you', but instead change the emphasis completely by adding just one more word,' How can I help you?" William Forde: January 5th, 2015.