What is the past tense of "affect"?

The past simple of "affect" is "affected". The bad weather will affect our travel plans tomorrow.

What is the past participle of "affect"?

The past participle of "affect" is "affected". Use it after have/has/had: "I have affected".

What is a common mistake with "affect"?

Wrong: "Does the weather affect on our plans?". Correct: "Does the weather affect our plans?". The verb "affect" does not take the preposition "on"; use it directly with the object.

Conjugation of "Affect" — All Forms, Examples, and Usage

Q: Is "affect" regular or irregular?

"Affect" is a regular English verb. Both past simple and past participle are formed by adding -ed.

Q: How do you pronounce "affect"?

/əˈfɛkt/ — Two syllables, stress on second. Starts with schwa /ə/, then /ɛ/ like in "bet" (not like the noun "effect").

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All 12 Tenses of "Affect"

Quick reference table — every tense form of "affect" with the first-person example and a link to the grammar guide for that tense.

Tense	Example (I)	Quick rule
Simple Present	`I affect`	Used for habits, facts, routines, and permanent situations. Full rule →
Simple Past	`I affected`	Used for completed actions at a specific time in the past. Full rule →
Simple Future	`I will affect`	Used for predictions, decisions made at the moment, and promises. Full rule →
Present Continuous	`I am affecting`	Used for actions happening right now or temporary situations. Full rule →
Past Continuous	`I was affecting`	Used for actions in progress at a specific moment in the past. Full rule →
Future Continuous	`I will be affecting`	Used for actions that will be in progress at a specific future time. Full rule →
Present Perfect	`I have affected`	Used for past actions with present relevance, life experiences, or unfinished situations. Full rule →
Past Perfect	`I had affected`	Used for an action that was completed before another past action. Full rule →
Future Perfect	`I will have affected`	Used for an action that will be completed before a specific future time. Full rule →
Present Perfect Continuous	`I have been affecting`	Used for actions that started in the past and continue now, with focus on duration. Full rule →
Past Perfect Continuous	`I had been affecting`	Used for ongoing actions in the past that continued up to another past moment. Full rule →
Future Perfect Continuous	`I will have been affecting`	Used for actions that will have been ongoing up until a specific future time. Full rule →

Past Tense of "Affect" — Affected

The past simple of "affect" is "affected" — formed by adding "-ed". Use it for actions that were completed at a specific time in the past, such as "yesterday", "last week", or "in 2020". For the full grammar of this tense, see our simple past tense guide.

Past Participle of "Affect" — Affected

The past participle of "affect" is "affected" — the same form as the past simple, since "affect" is a regular verb. Use it after "have/has/had" for perfect tenses ("I have affected") and after "be" for passive voice ("It was affected").

Is "Affect" Regular or Irregular?

"Affect" is a regular English verb. Its past simple and past participle are both formed by adding "-ed" to give "affected". The 3rd-person singular present is "affects" and the gerund/present participle is "affecting".

Conjugation pattern: regular -ed

How to Pronounce "Affect" and Its Forms

Affect: /əˈfɛkt/ — Stress pattern: oO

Two syllables, stress on second. Starts with schwa /ə/, then /ɛ/ like in "bet" (not like the noun "effect").

Common mispronunciation of "affect"

Pronounced like "EF-fect" instead of "uh-FEKT"; second syllable gets the stress.

Syllable breakdown: af · fect

How to Use "Affect" — Common Grammar Patterns

Use as a verb: "This affects me." Do not confuse with "effect" (a noun). The verb-noun pair rhymes: affect (verb) creates an effect (noun).

S + V + direct object
S + V + how/whether clause

Example Sentences with "Affect" in Different Tenses

Simple Present: How did the decision affect the team's morale? B1
Simple Future: The bad weather will affect our travel plans tomorrow. B1

Common Collocations with "Affect"

affect the outcome
affect someone's life
deeply affect
negatively affect
affect public opinion

When to Use "Affect" vs Similar Verbs

"affect" vs "effect"

Affect is a verb meaning to influence; effect is a noun meaning result or consequence.

Smart synonyms — when to use each one

influence — for causing indirect effects or shaping behavior
impact — for strong or noticeable effects

Common Mistakes with "Affect"

Wrong: She affect often.
Correct: She affects often.
Add "s" to the verb when the subject is third-person singular (he/she/it).

Origin and Etymology of "Affect"

From Latin "affectare", meaning to work towards or influence.

Other Forms of "Affect"

Noun: effect

Conjugation Tables for "Affect"

Negative Forms

Simple present: I do not affect · He does not affect
Simple past: I did not affect · She did not affect
Present perfect: I have not affected · He has not affected

Question Forms

Simple present: Do you affect? · Does he affect?
Simple past: Did you affect?
Present perfect: Have you affected?

Passive Voice (where applicable)

Simple present passive: It is affected
Simple past passive: It was affected
Present perfect passive: It has been affected

Frequently Asked Questions About "Affect"

Is "affect" regular or irregular?: "affect" is a regular verb. Add -ed for past simple and past participle: "affected".
What is the past tense of "affect"?: The simple past of "affect" is "affected".
When do I use simple present vs present continuous with "affect"?: Use simple present for habits, facts, and routines: "I affect every day." Use present continuous for actions happening right now: "I am affecting right now."