The past tense of co-operate is co-operated
| Infinitive | to co-operate |
| Present Tense | co-operate / co-operates |
| Past Tense | co-operated |
| Present Participle | co-operating |
| Past Participle | co-operated |
| Singular | Plural |
|---|---|
| I co-operate | We co-operate |
| You co-operate | You co-operate |
| He/She/It co-operates | They co-operate |
| Singular | Plural |
|---|---|
| I am co-operating | We are co-operating |
| You are co-operating | You are co-operating |
| He/She/It is co-operating | They are co-operating |
| Singular | Plural |
|---|---|
| I have co-operated | We have co-operated |
| You have co-operated | You have co-operated |
| He/She/It has co-operated | They have co-operated |
| Singular | Plural |
|---|---|
| I have been co-operating | We have been co-operating |
| You have been co-operating | You have been co-operating |
| He/She/It has been co-operating | They have been co-operating |
| Singular | Plural |
|---|---|
| I co-operated | We co-operated |
| You co-operated | You co-operated |
| He/She/It co-operated | They co-operated |
| Singular | Plural |
|---|---|
| I was co-operating | We were co-operating |
| You were co-operating | You were co-operating |
| He/She/It was co-operating | They were co-operating |
| Singular | Plural |
|---|---|
| I had co-operated | We had co-operated |
| You had co-operated | You had co-operated |
| He/She/It had co-operated | They had co-operated |
| Singular | Plural |
|---|---|
| I had been co-operating | We had been co-operating |
| You had been co-operating | You had been co-operating |
| He/She/It had been co-operating | They had been co-operating |
| Singular | Plural |
|---|---|
| I will co-operate | We will co-operate |
| You will co-operate | You will co-operate |
| He/She/It will co-operate | They will co-operate |
| Singular | Plural |
|---|---|
| I will be co-operating | We will be co-operating |
| You will be co-operating | You will be co-operating |
| He/She/It will be co-operating | They will be co-operating |
| Singular | Plural |
|---|---|
| I will have co-operated | We will have co-operated |
| You will have co-operated | You will have co-operated |
| He/She/It will have co-operated | They will have co-operated |
| Singular | Plural |
|---|---|
| I will have been co-operating | We will have been co-operating |
| You will have been co-operating | You will have been co-operating |
| He/She/It will have been co-operating | They will have been co-operating |
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