YOU SAID:
I haven't slept in eighteen hours and I'm very angry about it
INTO JAPANESE
私は18時間寝ていません、そして私はそれについて非常に怒っています
BACK INTO ENGLISH
I haven't slept for 18 hours and I'm very angry about it
INTO JAPANESE
私は18時間寝ていません、そして私はそれについて非常に怒っています
BACK INTO ENGLISH
I haven't slept for 18 hours and I'm very angry about it
That didn't even make that much sense in English.