I originally didn't
我本不应该做的。
I shouldn't have done it.
我本不想来,
I didn’t want to come in the first place.
— 蔷花,红莲 (2003)
我本不想说的
I didn't want to say anything in the first place.
— 美国黑帮 (2007)
我本不打算这么做
I didn't intend to do this.
— 城市英雄 (1993)