Question

Can you start a sentence with As?
Ms. Sue
Yes.

If you have a sentence in mind, please post it and we'll be glad to comment on it.

annie
As said by Martin Luther king:" A lie cannot live."
Ms. Sue
Yes. That's good.

annie
okay thanks Ms.Sue!
Writeacher
Change the colon to a comma, and it'll be perfect!
annie
why wouldn't the colon be acceptable?
Writeacher
The part before the colon is not a complete sentence. It's a dependent (subordinate) clause.
annie
oh I see it now thanks!
Writeacher
You're welcome!