The past tense of demonstrate is demonstrated
| Infinitive | to demonstrate |
| Present Tense | demonstrate / demonstrates |
| Past Tense | demonstrated |
| Present Participle | demonstrating |
| Past Participle | demonstrated |
| Singular | Plural |
|---|---|
| I demonstrate | We demonstrate |
| You demonstrate | You demonstrate |
| He/She/It demonstrates | They demonstrate |
| Singular | Plural |
|---|---|
| I am demonstrating | We are demonstrating |
| You are demonstrating | You are demonstrating |
| He/She/It is demonstrating | They are demonstrating |
| Singular | Plural |
|---|---|
| I have demonstrated | We have demonstrated |
| You have demonstrated | You have demonstrated |
| He/She/It has demonstrated | They have demonstrated |
| Singular | Plural |
|---|---|
| I have been demonstrating | We have been demonstrating |
| You have been demonstrating | You have been demonstrating |
| He/She/It has been demonstrating | They have been demonstrating |
| Singular | Plural |
|---|---|
| I demonstrated | We demonstrated |
| You demonstrated | You demonstrated |
| He/She/It demonstrated | They demonstrated |
| Singular | Plural |
|---|---|
| I was demonstrating | We were demonstrating |
| You were demonstrating | You were demonstrating |
| He/She/It was demonstrating | They were demonstrating |
| Singular | Plural |
|---|---|
| I had demonstrated | We had demonstrated |
| You had demonstrated | You had demonstrated |
| He/She/It had demonstrated | They had demonstrated |
| Singular | Plural |
|---|---|
| I had been demonstrating | We had been demonstrating |
| You had been demonstrating | You had been demonstrating |
| He/She/It had been demonstrating | They had been demonstrating |
| Singular | Plural |
|---|---|
| I will demonstrate | We will demonstrate |
| You will demonstrate | You will demonstrate |
| He/She/It will demonstrate | They will demonstrate |
| Singular | Plural |
|---|---|
| I will be demonstrating | We will be demonstrating |
| You will be demonstrating | You will be demonstrating |
| He/She/It will be demonstrating | They will be demonstrating |
| Singular | Plural |
|---|---|
| I will have demonstrated | We will have demonstrated |
| You will have demonstrated | You will have demonstrated |
| He/She/It will have demonstrated | They will have demonstrated |
| Singular | Plural |
|---|---|
| I will have been demonstrating | We will have been demonstrating |
| You will have been demonstrating | You will have been demonstrating |
| He/She/It will have been demonstrating | They will have been demonstrating |
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