YOU SAID:

Dude school is cancelled because a kid brought a gun its the 900000000th time this has happened

INTO JAPANESE

子供が銃を持ってきたので、これが起こったのは900000000回目です。

BACK INTO ENGLISH

This happened 900,000,000 times since the child brought a gun.

INTO JAPANESE

子供が銃を持ってきて以来、これは9億回起こった。

BACK INTO ENGLISH

This has happened 900 million times since the child brought the gun.

INTO JAPANESE

子供が銃を持ってきて以来、これは9億回起こっています。

BACK INTO ENGLISH

This has happened 900 million times since the child brought the gun.