At the LEAP Institute, they teach mental-health professionals how to build enough trust with the mentally ill person that he will follow advice even if he won't admit to being sick
请问:这里的that单独出现引导的是状语从句吗?
A bank is the place where they lend you an umbrella in fair weather and
ask for it back when it begins to rain.这里的先行词是the place,是一个单数, 为什么后面从句的主语就用they?