I'll appear only when you need me.

我只会在你们需要我的时候才出现。

youdao

If I was to leave when you need me most.

所以不会在你最需要我的时候离开的。

youdao

But I can be there now and when you need me to care.

但现在我可以呆在你身边，给予你安慰。

youdao

You help me when I need it.

NPR: Miami's Cuban Exile Community Evolves Again

"When you can tell me which cancers need to be treated and which don't, then I will consider this argument" about overdiagnosis, says Clifford Hudis, chief of the Breast Cancer Medicine Service at Memorial Sloan-Kettering Cancer Center in New York City.

WSJ: Can Breast Cancer Be Overtreated?

When I ask about sources of income and assets, you need to tell me.

FORBES: My Best Tax Advice Ever, Part IV: Don't Lie to Me