Because "business" without an article (the/a) or possessive adjective (my/your/his/her/its/our/you-guys's/their) is defined as a concept, and concepts just do not work with the term "get right on."Thanks, but what makes it not right for "business" but right for "a task" in (2)?
I agree. Well, if I heard it, I would not have problems in understanding the meaning intended, but it would sound funny to me too.It may be AE/BE, but "Let's get right on a task," doesn't mean anything to me. I mean, I can guess now because I've seen the two sentences at the top, but otherwise I would be confused.