Word: 不行 (bùxíng)

不行，今天不知为何没有干劲。

Bùxíng, jīntiān bùzhī wèihé méiyǒu gànjìn.

It's useless, I'm not motivated today for some reason.

不行春风，难得夏雨

bùxíng chūnfēng, nándé xià yǔ

without spring winds, you can hardly get summer rain

他买一把刀行，我买就不行了吗？

Tā mǎi yì bǎ dāo xíng, wǒ mǎi jiù bùxíngle ma?

If it's okay for him to buy a knife, then why on earth can't I?

他要不行了。

Tā yào bùxíngle.

He's on his last legs.

企者不立，跨者不行。

Qǐzhě bú lì, kuàzhě bùxíng.

The one who tip-toes does not stand; the one who strides widely does not walk.

体育我很不行。

Tǐyù wǒ hěn bùxíng.

I am not good at sports.

切丝要看刀工，我还不行。

Qiē sī yào kàn dāogōng, wǒ hái bùxíng.

Cutting shreds takes knife skills, and I'm not there yet.

处家人情,非钱不行

chǔ jiā rénqíng,fēi qián bùxíng

for family life and social courtesies, nothing works without money

她说自己不行，只是谦辞。

Tā shuō zìjǐ bùxíng, zhǐshì qiāncí.

She says she isn't good, but that's just modesty.

我想还待一夜，行不行？

Wǒ xiǎng hái dài yí yè, xíng bùxíng?

I'd like to stay one more night. Is that possible?

我觉得这主意不行。

Wǒ juéde zhè zhǔyi bùxíng.

I don't think this is a good idea.

热油锅煎豆腐，不翻不行

rè yóuguō jiān dòufu, bù fān bùxíng

frying tofu in a hot oil pan: it has to be turned

现有的办法都不行。

Xiànyǒu de bànfǎ dōu bùxíng.

None of the existing methods work.

蛇无头不行

shé wú tóu bùxíng

a snake without a head can't go

跑到最后，我的体能快不行了。

Pǎo dào zuìhòu, wǒ de tǐnéng kuài bùxíngle.

By the end of the run, my stamina was giving out.