i like pandas.why is that?为什么要is 不是复数?

My favorite animal is pandas.为什么复数前用单数. That is why I took That is what i am here for为什么不用why The reason why I do not like shopping is that I am so tired It is not that I do not like plays.The reason why I did not 1、that is why i like reading books and i study harder in cla The main reason why pandas are endangered is that the area w All that glitters is not gold.为什么不是are 而是is,glitters是复数呀 This is that why i like it best.请帮忙解释清楚语法上的错误, 为什么是why me不是why is me why is that?意思? why is that?