Passed vs. Past: Which One Do You Need?

The One Rule

• Passed is always a verb — the past tense and past participle of to pass.
• Past is never a verb — it functions as a noun, adjective, adverb, or preposition.

If the word in question is a verb (or part of a verb phrase), use passed. If the word is anything else, use past.

Passed: Always a Verb

Passed is the simple past tense and past participle of pass. It is used whenever pass acts as a verb in a sentence.

As simple past:

• She passed the exam on her first attempt.
• The time passed quickly.
• He passed the report to his manager.
• We passed the building without stopping.

As past participle (with a helping verb):

• Two weeks have passed since the deadline.
• The bill was passed by a wide margin.
• She had passed every requirement before the final review.

Past: Four Grammatical Roles

Past functions in four ways, none of which is a verb.

Past as a noun

• We cannot change the past.
• She has a complicated past.
• The team learned from the mistakes of the past.

Past as an adjective

• The past few months have been challenging.
• She reviewed her past performance reviews.
• In past years, the process was handled differently.

Past as a preposition

As a preposition, past means "beyond" in space or time:

• Walk past the library and turn left.
• It is half past three.
• We drove past the venue without realizing it.
• The project has gone past its original scope.

Past as an adverb

As an adverb, past indicates movement by a point:

• The train went past without stopping.
• She walked past quickly.
• The weeks flew past.

Note: when past works as an adverb and passed might seem to fit, test by asking whether there is an explicit action (verb) performing the movement. The train went past — "went" is the verb; "past" is an adverb. The train passed — "passed" is the verb. Both can be correct depending on which element you want to emphasize.

The Test

Ask one question: is this word functioning as a verb?

• Can you substitute a different form of pass? (passes, passing, will pass) If yes, use passed.
• Can you substitute a form of another verb that changes the meaning? If the word is not a verb at all (it modifies a noun, indicates a location, refers to time) — use past.

Examples of the test in action:

• She ___ the document to the team. → substituting "passes" works → passed
• She walked ___ the building. → can't substitute "passes the building" sensibly → past (preposition)
• The ___ three days were difficult. → no verb role → past (adjective)
• Two months have ___ since the launch. → "have been passing" works → passed (past participle)

Common Errors in Context

Past Tense vs. "Past" the Word

A source of confusion is that the grammar term "past tense" uses past as an adjective. This does not mean the word past is itself a verb. In the phrase past tense, past modifies the noun tense — it is an adjective. The verb form, by contrast, is always passed: she passed the building is a sentence in the past tense, and the verb passed is spelled with a d.

Frequently Asked Questions

Is "drove past" or "drove passed" correct?

Drove past is correct. Drove is the verb; past is a preposition indicating the direction of movement beyond a point. Passed would need to be the verb: She passed the building (passed = verb) vs. She drove past the building (drove = verb, past = preposition).

What about "half past three"?

Past — it is used as a preposition meaning "beyond" the hour. This is a fixed time expression and always uses past, never passed.

Can "past" ever precede a helping verb?

No. If a helping verb like has, have, had, was, were precedes the word, you need the past participle of pass, which is passed: has passed, have passed, had passed, was passed, were passed. The word past never follows a helping verb in standard English.