No. When you submit an assignment, you are not required to write an essay. Your trainer will not grade you based on spelling or grammar or word construction abilities. Your trainer is only looking to see if you answered all the questions asked in the assignment clearly and accurately. If a paragraph-style response is required, then the curriculum will state that explicitly. If an assignment is marked incomplete, then an explanation and a request for further or different answers will be included with the marking. Also sometimes a trainer will ask for further clarification in some of your answers in order to mark the assignment as complete. This does not hinder or lower your finishing grade at all.