①从句是动词后再加的一个句子,因此the brightness of sunshine不是,what color red is用了陈述句的语序,但有主语、谓语,因此是从句.
②what i had been left是做the loss of them 的定语.
③可能是吧,第一个THAT是在强调信念,自信
④是的.it took me years 本来是一个完整的句子了,又加上to discover and strengthen this assurance来补充说明
主语+谓语（及物动词）+宾语+宾语补足语（+状语）例如：We can help you develop new skills.I don,t want you too work too hard.The news made everyone happy.