Passed and Past
Incorrect : A week has past since I saw her.
Correct : A week has passed since I saw her.
Incorrect : Don't think of the passed.
Correct : Don't think of the past.
Note : Past is not a verb but passed is a verb (the past and past participle form of "pass'). In the correct sentence above, past is used as a noun. It can, however, be used in other ways too. For example:
The past week was very cold. (adjective)
We walked past the library. (preposition)
The bus went past. (adverb)
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