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