The 12 core units in BOOST! WRITING 4 follow a clear and transparent structure to make teaching and learning easy and fun. The writing skills build and progress across the 4 levels of Boost! writing and are correlated to the next generation of tests of English. You will find the following in BOOST! WRITING 4 : age-approproate and cross-curricular topics models of good writing as well as examples of bad writing practice that builds from sentence and paraqgraph levels to full-length passages activities that provide an opportunity to create a wide variety of text types: essays, letters, e-mails, etc.