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