我不否定这个可能性。

Wǒ bù fǒudìng zhège kěnéngxìng.

I’m not ruling out that possibility.

你凭什么这么快否定我的想法呢？

Nǐ píng shénme zhème kuài fǒudìng wǒ de xiǎngfǎ ne?

What gives you the right to dismiss my idea so quickly?

他对自己的能力从来没有否定过。

Tā duì zìjǐ de nénglì cónglái méiyǒu fǒudìng guò.

He has never denied his own abilities.