She got the promotion.
She is good at her job.
If the first sentence is a result of the second sentence, there are three ways to write it:
She got the promotion because she is good at her job.
She got the promotion as she is good at her job.
She got the promotion, since she is good at her job.
In an absolute grammatical sense, all three sentences are correct. But, as with all self-proclaimed language mavericks, we are uncomfortable with “as” and “since” used as causative conjunctions.
Read more…
Limp Cabbage and Soggy Chips (Call me limp!) 
I would disagree on starting a sentence with because (or another conjunction), as long as the subordinate clause is followed by a main clause. https://www.quickanddirtytips.com/education/grammar/can-you-start-a-sentence-with-because
LikeLike
I know, Ashley. But this article is meant for people who are not comfortable in English. I’ve noticed that many start a sentence with because, and stop with the subordinate clause. Another reason for the caveat is that most of my clients write in science. In science, it is generally preferred to write simple sentences of the form RESULT because CAUSE. For creative and nontechnical writing, what you say holds absolutely true. I did not want to add too many caveats to the rule in the article.
But yes, you are right. Because the sky is blue it makes me cry is not grammatically wrong. I made a minor change to the article to reflect the flexibility of the rule. Thanks for pointing that out.
LikeLiked by 1 person