编辑一段英语写作，以使其表达更加准确和优美。
"David is learning English. He is studying hard and has made much progress. He is confident in his ability to communicate in English."
David is endeavoring to improve his proficiency in English and dedicating himself to diligent study, resulting in considerable advancements. Consequently, he possesses a deep sense of assurance in his capacity to proficiently express himself in English.