He were bitten by mosquitoes vs He bit by mosquitoes

Some examples from the web:

• I'll close this so you won't get bitten by mosquitoes.
• And I was glad when I finally woke up and found myself bitten by mosquitoes.
• I'm not buying that all 4 of these people got bitten by mosquitoes.
• Well, you were bitten by a banana spider.
• They were bitten by a human.
• Heather, you were bitten by a hobo spider.
• You were bitten by an inmate from a prison awash in hep-C.
• I know all about you, Mr. Crow. I know your parents were bitten by vampires.
• Well, you were bitten by a banana spider.
• Is there any chance that you were bitten by a wild animal?
• When you were bitten by the zombies, did you feel any sensation besides pain?
• You're saying... the evidence shows that Charlie and the victim both were bitten by an as-yet unknown third party.
• You were bitten by that Bat Boy, weren't you?
• You were bitten by a vampire, and you don't remember anything that happened?
• I guess you were bitten by the thief.
• Your last tetanus shot was when you were bitten by a bat a few months ago?
• They were bitten... and they're fine.
• It's spread by mosquitoes in Africa, Southern India and Southeast Asia.
• I'm an escaped convict who is plagued by mosquitoes.
• Now, malaria is of course transmitted by mosquitoes.

Some examples from the web:

• It's spread by mosquitoes in Africa, Southern India and Southeast Asia.
• I'm an escaped convict who is plagued by mosquitoes.
• Now, malaria is of course transmitted by mosquitoes.
• He thought it was transmitted by mosquitoes.
• I am not concerned with be eaten by mosquitoes.
• This dog is eaten up by mosquitoes.
• The virus is transmitted by mosquitoes which also act as an important reservoir.
• I'll close this so you won't get bitten by mosquitoes.
• Possibly as a result of global warming such diseases as bluetongue, which is transmitted by mosquitoes, have recently appeared in temperate latitudes.
• Possibly as a result of global warming, such diseases as bluetongue, which is transmitted by mosquitoes, have also recently appeared in temperate latitudes.
• And I was glad when I finally woke up and found myself bitten by mosquitoes.
• The heaven has ordered for the squires that they are stung by mosquitoes and killed of hunger.
• Well then, to the last Fourth of July weekend I'll spend getting eaten alive by mosquitoes.
• So you've got a West Nile-like virus that's not being spread by mosquitoes.
• I'm not buying that all 4 of these people got bitten by mosquitoes.
• Discovered last autumn and transmitted by mosquitoes and gnats, the virus causes fever, a consistently decreased milk yield and even congenital deformities in neonates.
• Zika virus is a member of the Flaviviridae family and is transmitted to humans by mosquitoes.
• I was harried by mosquitoes last night.
• Marfoushka is pested by mosquitoes, she can't sleep.
• - He bit me quite hard.