| Present Tense | Past Tense | Future Tense |
|---|---|---|
| I cost | I cost | I shall/will cost |
| We cost | We cost | We shall/will cost |
| You cost | You cost | You will cost |
| He costs | He cost | He will cost |
| She costs | She cost | She will cost |
| It costs | It cost | It will cost |
| They cost | They cost | They will cost |
| Present Continuous | Past Continuous | Future Continuous |
|---|---|---|
| I am costing | I was costing | I shall/will be costing |
| We are costing | We were costing | We shall/will be costing |
| You are costing | You were costing | You will be costing |
| He is costing | He was costing | He will be costing |
| She is costing | She was costing | She will be costing |
| It is costing | It was costing | It will be costing |
| They are costing | They were costing | They will be costing |
| Present Perfect | Past Perfect | Future Perfect |
|---|---|---|
| I have cost | I had cost | I shall/will have cost |
| We have cost | We had cost | We shall/will have cost |
| You have cost | You had cost | You will have cost |
| He has cost | He had cost | He will have cost |
| She has cost | She had cost | She will have cost |
| It has cost | It had cost | It will have cost |
| They have cost | They had cost | They will have cost |
| Present Perfect Continuous | Past Perfect Continuous | Future Perfect Continuous |
|---|---|---|
| I have been costing | I had been costing | I shall/will have been costing |
| We have been costing | We had been costing | We shall/will have been costing |
| You have been costing | You had been costing | You will have been costing |
| He has been costing | He had been costing | He will have been costing |
| She has been costing | She had been costing | She will have been costing |
| It has been costing | It had been costing | It will have been costing |
| They have been costing | They had been costing | They will have been costing |