用it做形式主语就是为了句子可读性更强,避免头重脚轻.
所以当主语（或宾语）是从句、不定式和动名词短语时,因为结构过长,所以用it的形式主语句型.
how在这里属于疑问词,可以是句子里的表语或状语,也就是说,可以充当形容词或副词成分.
举个例子吧：
I feel (good). 对括号中的成分提问,必然是How do you feel? 对吧?
feel确实是系动词没错,这里how是表语.
Can you imagine how it feels to be blind?中的it为什么是形式主语
3个回答
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can you feel it?i want to be with you.i will be with you.
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what it makes you feel还是 how it makes you feel