Be sensitive to how much your friend can and can't offer you--be it time, energy, or help -- and don't step over the line.

【翻译】要体谅你的朋友能给你多少，不能给你多少——不管是时间、精力还是帮助——都不要越界。

be it time, energy or help：whether it is time, energy or help

be it... 是古英语遗留下来的一种倒装式虚拟语气，主要用于让步从句或条件句。be动词用原形。又如：

She exhibits the idealism common to many advocates of sustainability, be it in food or in energy.

她展示了许多可持续发展倡导者所共有的理想主义，无论是在食品还是能源领域。

She enjoys watching dance, be it ballet, national minority dancing or any other sort of dancing.

(= whether it is ballet...)

芭蕾舞也好，民族舞也好，随便什么舞她都喜欢看。

来自《现代汉英综合大词典》

Speak frankly, I pray you, be it for life or death. "

(= whether it is for life or death)

我请你坦率地讲出来, 不管我是该活还是该死。”

来自英汉文学 - 红字

Be it a painting, a photograph, a poem or a novel, if you created it, you own it and it’s the copyright law itself that assures that ownership.

(= whether it is a painting...)

不管是一张画，一张相片，一首诗或是一本小说，如果你创造了它，你就拥有了它，而它的版权法本身就保证其所有权。

Home is home, be it ever so homely.

(= whether it is ever so homely)

家就是家，不管它是多么平凡。