did he realize】 what the festival really means to commemorate a famous Chinese poet and patriot

did he realize】 what the festival really means to commemorate a famous Chinese poet and patriot
However,not until he visited China,witnessed the dragon boat racing and tried Zongzi,a traditional food made of glutinous rice and served during the festival,【【【did he realize】】】 what the festival really means to commemorate a famous Chinese poet and patriot,Qu Yuan,in Spring and Autumn Dynasty.
請問這裡的【【【did he realize】】】是做強調的意思嗎?
我們一般說強調不都是 i do see believe sth嗎
最多也就是祈使句do come and see me some day!
這裡的【【【did he realize】】】是什麽意思的什麽語法呢?麻煩大家指導一下小弟...

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