be of改为疑问句of就不是介词了吗?
I don' t know what plant the seed is of.
陈述句语序。
What plant is the seed of?
疑问句语序。
这里,of 表示“隶属关系”。意思是说“这种子属于什么植物的”。以下四种表达都正确:
What plant is the seed of?
Of what plant is the seed?
I don' t know what plant the seed is of.
I don' t know of what plant the seed is.
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