Learn how to use the expression 'to hit the ground running' and the phrasal verb 'to fall behind'! This class is spread out over four tracks. In this first part I'll explain how to use them and give loads of examples in context. You'll also have a chance to try and keep up with me in the interactive Sentence Builder section! More info: http://keyteenglish.com/es/hit-the-ground-running-and-fall-behind/