If you say “I born in 1999”, this is incorrect.
The right way to say it is “I was born in 1999.”
This is because born is not a verb you can use directly in the past simple when referring to having a baby. It’s the past participle of bear (in the sense of “to give birth to”), and we always use it in the passive form — was/were born.
You didn’t do the action; it happened to you.
Correct: I was born in Barcelona.
Incorrect: I born in Barcelona.
There are other words can be used in a similar way.
There are other words can be used in a similar way.
He is rumoured to be leaving the company.
Other people are talking about his employment and creating the rumour.
They rumour him to be leaving the company.
She is said to be unhappy.
Other people think she is unhappy and are talking about it.
“I am unhappy,” she said. This is what she said.
He was taken ill last Saturday.
Take is always passive when used with ill.