If convenient, please help me fetch the parcel from the post office.

如果方便的话，请帮助我从邮局取回包裹。

youdao

If convenient, I would like to contact you one week later to further discuss any possible interview arrangement.

如果方便的话，我将在一周之后与您联系，确认面试的具体事宜。

youdao

If it's convenient I can come tomorrow.

方便的话，我可以明天过来。

《牛津词典》

For example, if it's more convenient should you change the environment to make the unhealthy food less convenient and make healthy foods more convenient?

举例来说,如果是因为方便,那你改变外部环境,会使得健康食品比垃圾食品更容易获得吗

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

So it's convenient if you wanna check and see when the next bus is coming.

用手机可以查下一趟车什么时候来，非常方便。

没有智能手机活不了 - SpeakingMax英语口语达人

Rooms come outfitted with a fully stocked desk, which is easy and convenient if you are in town on business.

FORBES: Hotel Of The Day: Peninsula New York

It would be very convenient if my utility recommends such products to consumers based on the Energy Efficiency ratings and the load pattern in my neighborhood.

FORBES: When the lights went out, my light went on

Dr. SPIESEL: In the old days, chicken pox was thought to be so benign that it was thought that well, it would be convenient if you could control when children would get the disease.

NPR: Slate's Medical Examiner: Chickenpox Vaccine Risks