The comma before and in a list avoids ambiguity. It's always better to put a comma before the last item in a list of 3 or more items.| Just Publishing Advice For Writers and Authors
Parallelism means using the same grammatical structures within a single sentence or across two or more sentences.| Just Publishing Advice For Writers and Authors
Most of the time, usually and normally are synonyms. But take care, because there are certain uses when only one is possible.| Just Publishing Advice For Writers and Authors