我可以保证这个计划成功。
wǒ kěyǐ bǎozhèng zhègè jìhuá chénggōng 。
I can guarantee that this plan will succeed.
他向我保证,他会准时到。
tā xiàng wǒ bǎozhèng , tā huì zhǔnshí dào 。
He guaranteed me that he would arrive on time.
这项服务有质量保证。
zhèxiàng fúwù yǒu zhìliàng bǎozhèng 。
This service comes with a quality guarantee.