【明報專訊】Over the past months, I've discussed points of English grammar that native Chinese speakers routinely get wrong: singulars and plurals, articles (the words "the," "a" and "an"), punctuation (commas, periods and other marks), and verb tenses. These points, small as they might seem, are essential: incorrect grammar not only looks bad, but it can cause confusion and misunderstanding – and misunderstanding can cost you and others time, money and embarrassment.