a boy is chased by a cat vs a boy is being chased by a cat

Some examples from the web:

• A moose eats cheese and is chased by cats.
• Sally lied about what happened and a boy is dead.
• Hannah, a boy is dying in the hospital as we speak.
• Cara, a boy is dead.
• A boy is throwing a stone.
• A boy is nothing without his mother.
• This is what happens when a boy is raised by Captain Caveman.
• A boy is more important, elizabeth.
• But... liking a boy is not a sin.
• And before you all laugh, a boy is dead.
• Any girl who calls up a boy is just asking for trouble.
• I've heard a boy is trampled and like to die.
• But a boy is too much to put up with day and night.
• When a boy is born... water which was bathed, is thrown on the street.
• Jane McGonigal told us last year that by the time a boy is 21, he's played 10,000 hours of video games, most of that in isolation.
• The only time you should lay hands on a boy is to give him a good pat on the back.
• This way you can find out what a boy is selling long before you talk to him.
• A boy is dead, a father lost his son.
• For instance, if a boy is molested by his mother or abused by his father, the original...
• A boy is here to see you.

Some examples from the web:

• At least, I get to see her, even if she is being chased by a psycho with a machete.
• I said, Tak Gu is being chased by someone right now!
• I was being chased by something and I ran in a long corridor.
• I'm being chased by lots of men.
• Behave naturally, please. I'm being chased by someone.
• The former host, Ajay, was being chased by bad men.
• It was about a bloke being chased by police in a Dodge Challenger.
• We are being chased by an unidentified entity.
• Once I thought I was being chased by carrots with machetes.
• We are being chased by gunmen, in black sedan.
• I'm being chased by a ghost... like stalker.
• I am still inside, being chased by dogs.
• (Gasps) Imagine you're being chased by zombies.
• I was being chased by the paparazzi and lost control of the car.
• The animal's being chased by a hyena.
• I'm guessing that he's being chased by loan sharks.
• After a long day being chased by rebels, relax with nuts.
• We were being chased by security.
• This is way better than being chased by a gorilla.
• I was being chased by a gang of bees.