Can I say "Who caused the accident was very careless"?

Hello everybody, Can I write
WHO caused the accident was very careless. May I use WHO?
Thank you

Hi Zulfiya,

The simple answer is ‘no’. If you start a sentence just with ‘who’, it becomes a question: ‘Who caused the accident?’ There are two possibilities if you don’t know who the person is, you can say: ‘The man/woman/person who caused the accident …’ or you can say: ‘Whoever caused the accident …’

Best wishes


Hi Alan, thank you very much.
Best wishes.