If not now,when ? If not us,who?说这话是想表达什么情感?

It's not you,who?If not now,when?请问这句话中文是什么意思. 英语翻译If We Can't Love Our Neighbor Who are not like us,if we If not 什么意思 if not After all what are true friends for,if not to help us when w Not If,But When,求标题翻译, 英语翻译If I am not for myself,who is for me?When I am for mysel if never,if any,if not,if IF ANY,IF SO,IF NOT,IF 女朋友说What if I`m not brave,who will take the courage for me?她 他说这话是想表达什么意思,我不理解. 请问if at all ,if not more so,if not impossible分别什么意思