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