Sometimes, if you think people are going to be there, you're not 100% sure until you need them whether they are, you may not have been there for them in the past, they might hold a grudge.
有时候,如果你认为人们会在那里的,你只有在需要他们的时候才能百分百确定他们是否在那里,你过去可能没有在他们身边,而他们可能怀恨在心。