1.People from East Asia tend to have more difficulty than those from Europe in distinguishing facial expressions.
问题描述：
1.People from East Asia tend to have more difficulty than those from Europe in distinguishing facial expressions.
为什么是those who为什么不可以
2.I really do not think there will be a power failure tonight,but I have bought some candles in case there is
为什么是is 不是there will be?
答
1 those from Europe 这是介词结构做后置定语
who?加个are做成从句才行
2 in case引导的状语从句（不管是目的还是条件）,现在表将来