You must be competent to do the job.

你得有足够的能力来做这项工作。

Be competent with taxes and banking.

精通税务及银行业务。

I think you'd be competent for this job.

我想你能胜任这份工作。

I am sure I will be competent for this job soon.

这个工作我相信我能很快上手。

Jack found Milo to be competent, though frequently naive.

杰克认为米洛是个能干的手下，只不过常常有点天真。