in red这种类型的,in 后面加的都是名词吗?in pen?in order?in difficulty?.

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in red这种类型的,in 后面加的都是名词吗?
in pen?in order?in difficulty?.

名词 prep+n.or pron.

No ,as "in red",red is an adjective,not a noun .
Also,in hospital (prep+pron)