| 1. | Base Form (Infinitive): | Decrease |
| 2. | Simple Past: | Decreased |
| 3. | Past Participle: | Decreased |
| 4. | Present Participle: | Decreasing |
| 5. | 3rd Person Singular: | Decreases |

Decrease past tense
| Decreased |
| Decreased is the past tense of the word decrease. |
Decrease past participle
| Decreased |
| Decreased is the past participle of the word decrease. |
Decrease verb forms V1 V2 V3 V4
| Infinitive | Past Simple | Past Participle | Present Participle |
|---|---|---|---|
| Decrease | Decreased | Decreased | Decreasing |
Conjugation of Decrease
| Simple / Indefinite Present Tense |
| I decrease the volume of the television. |
| He/She/It decreases the volume of the television. |
| You/We/They decrease the volume of the television. |
| Simple Past Tense |
| I decreased the volume of the television. |
| He/She/It decreased the volume of the television. |
| You/We/They decreased the volume of the television. |
| Simple Future Tense |
| I will/shall decrease the volume of the television. |
| He/She/It will decrease the volume of the television. |
| You/We/They will/shall decrease the volume of the television. |
| Present Continuous Tense |
| I am decreasing the volume of the television. |
| He/She/It is decreasing the volume of the television. |
| You/We/They are decreasing the volume of the television. |
| Past Continuous Tense |
| I was decreasing the volume of the television. |
| He/She/It was decreasing the volume of the television. |
| You/We/They were decreasing the volume of the television. |
| Future Continuous Tense |
| I will be decreasing the volume of the television. |
| He/She/It will be decreasing the volume of the television. |
| You/We/They will be decreasing the volume of the television. |
| Present Perfect Tense |
| I have decreased the volume of the television. |
| He/She/It has decreased the volume of the television. |
| You/We/They have decreased the volume of the television. |
| Past Perfect Tense |
| I had decreased the volume of the television. |
| He/She/It had decreased the volume of the television. |
| You/We/They had decreased the volume of the television. |
| Future Perfect Tense |
| I will have decreased the volume of the television. |
| He/She/It will have decreased the volume of the television. |
| You/We/They will have decreased the volume of the television. |
| Present Perfect Continuous Tense |
| I have been decreasing the volume of the television. |
| He/She/It has been decreasing the volume of the television. |
| You/We/They have been decreasing the volume of the television. |
| Past Perfect Continuous Tense |
| I had been decreasing the volume of the television. |
| He/She/It had been decreasing the volume of the television. |
| You/We/They had been decreasing the volume of the television. |
| Future Perfect Continuous Tense |
| I will have been decreasing the volume of the television. |
| He/She/It will have been decreasing the volume of the television. |
| You/We/They will have been decreasing the volume of the television. |