Subject + 失败
失败 (shībài) can function as both a verb meaning "to fail" and an adjective or noun meaning "failure." It describes an unsuccessful outcome. For example, 承认失败 means "to admit failure."
这次考试我失败了,下次一定要努力。
Zhè cì kǎoshì wǒ shībài le, xià cì yídìng yào nǔlì.
I failed this exam; I must work harder next time.
他不愿意承认自己的失败。
Tā bù yuànyì chéngrèn zìjǐ de shībài.
He is unwilling to admit his own failure.
这个计划失败的原因是准备不够充分。
Zhège jìhuà shībài de yuányīn shì zhǔnbèi bú gòu chōngfèn.
The reason this plan failed was insufficient preparation.