What is the past tense of "demo"?

The past simple of "demo" is "demoed". The teacher will demo the new software in class.

What is the past participle of "demo"?

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

What is a common mistake with "demo"?

Wrong: "demonstrate the software". Correct: "demo the software". demo is more natural in tech and business contexts

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

Q: Is "demo" regular or irregular?

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

Q: How do you pronounce "demo"?

/ˈdɛm.oʊ/ — stress the first syllable: DEM-oh. the o is like oh in go, not like letter o

Look up another verb

All 12 Tenses of "Demo"

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

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

Past Tense of "Demo" — Demoed

The past simple of "demo" is "demoed" — 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.

The developer demoed the beta version at the tech conference. B2

Past Participle of "Demo" — Demoed

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

The developer demoed the beta version at the tech conference. B2

Is "Demo" Regular or Irregular?

"Demo" is a regular English verb. Its past simple and past participle are both formed by adding "-ed" to give "demoed". The 3rd-person singular present is "demos" and the gerund/present participle is "demoing".

Conjugation pattern: regular: demo→demoed, demoing (no spelling change)

How to Pronounce "Demo" and Its Forms

Demo: /ˈdɛm.oʊ/ — Stress pattern: Oo

stress the first syllable: DEM-oh. the o is like oh in go, not like letter o

Common mispronunciation of "demo"

duh-MOH (incorrect stress)

Syllable breakdown: dem · o

How to Use "Demo" — Common Grammar Patterns

use demo when physically showing or performing something, not describing

demo + object
demo to + audience
live demo

Example Sentences with "Demo" in Different Tenses

Simple Present: Can you demo this product to the client before we finalize the sale? B1
Simple Past: The developer demoed the beta version at the tech conference. B2
Simple Future: The teacher will demo the new software in class. A2

Common Collocations with "Demo"

demo a product
demo software
live demo
tech demo
demo version

When to Use "Demo" vs Similar Verbs

"demo" vs "explain"

explain uses words; demo shows practically, hands-on

Smart synonyms — when to use each one

show — general, simple
illustrate — explain with examples
present — formal, official

Antonyms: conceal, hide

Common Mistakes with "Demo"

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

Origin and Etymology of "Demo"

short for demonstrate, from Latin demonstrare (to show clearly)

in tech and gaming, a demo is often a free trial version. demo can also mean a protest march.

Conjugation Tables for "Demo"

Negative Forms

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

Question Forms

Simple present: Do you demo? · Does he demo?
Simple past: Did you demo?
Present perfect: Have you demoed?

Passive Voice (where applicable)

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

Frequently Asked Questions About "Demo"

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