YOU SAID:
I can't cry or I won't be able to stop.
INTO JAPANESE
私は泣くこともできないし、止めることもできないでしょう。
BACK INTO ENGLISH
I can not cry and I can not stop it.
INTO JAPANESE
私は泣くことができず、それを止めることもできません。
BACK INTO ENGLISH
I can not cry and I can not stop it.
That didn't even make that much sense in English.