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