这件事我会尽力去做，但不一定能成功。

Zhè jiàn shì wǒ huì jìnlì qù zuò, dàn bù yídìng néng chénggōng.

I will do my best with this matter, but I may not succeed.

只要我们一起用力，这张桌子就能搬走。

Zhǐyào wǒmen yìqǐ yònglì, zhè zhāng zhuōzi jiù néng bānzǒu.

As long as we use our strength together, we can move this table.

他用很大的力把门推开了。

Tā yòng hěn dà de lì bǎ mén tuīkāi le.

He used a lot of strength to push the door open.