公众从来都不相信他有能力胜任这份工作。

I've no doubt of your [ability].

youdao

我所学的专业和已有的工作经验使我有能力胜任这份工作。

My major and working experience will enable me to be competent for this position.

youdao

我相信我在校的训练，加上在工厂的实习使我有能力胜任这份工作。

I am sure that my school training combined with my practice in the factories should enable me to be qualified for this particular job.

youdao