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