Do you ever start a sentence with because?

Not really its not proper english However you can use them in a sentence

Some examples:

Because she was ill,she didnt go to school.

Because he was a amazing footballer,he got chosen to go to the brent football trials.

Because she had ifluenza, she didnt go to school for a while.

Because Wayne Rooney fouled another player, he recieved a yellow card.

YOU GET THE IDEA NOW i hoped this helped