- Past can be a noun, adjective or an adverb.
Noun – time that has elapsed; an earlier period in someone’s life
Adjective – earlier than the present time; no longer current
Adverb – a position beyond a certain point.
History deals with the past. (noun)
My past self is another person. (adjective)
He walked past the house. (adverb)
- Passed is the past simple and past participle form of the verb to pass.
To go across or through; move past; make laws, bills, etc. or bring into effect by legislation; elapse of time; to die; to succeed in an exam or test
Many cars passed by.
Forty years passed.
He barely passed the examination.