Here are some examples:
* As the sun rose, the birds began to sing.
* As I was walking down the street, I saw a dog running towards me.
* As you know, I'm a big fan of your work.
However, it is important to note that starting a sentence with "as" can sometimes sound a bit formal or archaic. In casual writing, it might be more common to use other conjunctions like "since" or "because."