Answer:
This year writing will be a major focus, its' important to understand grammer rules, without them you're writing is difficult to understand.
Writing is a major learning focus this year. One must understand and follow grammar rules. Without such rules, one's writing is incomprehensible.
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Once a week well begin class with one of these sets of M.U.G. sentences, M.U.G. by the way is an abbreviation of "mechanics, usage and grammer"
Once a week at the start of class, the instructional focus will be on mechanics, usage, and grammar.