| Present "cost" | I | cost | |
| Present Continuous "cost" | I | am costing | |
| Simple past "cost" | I | cost | |
| Past Continuous "cost" | I | was costing | |
| Present perfect "cost" | I | have cost | |
| Present perfect continuous "cost" | I | have been costing | |
| Past perfect "cost" | I | had cost | |
| Past perfect continuous "cost" | I | had been costing | |
| Future "cost" | I | will cost | |
| Future continuous "cost" | I | will be costing | |
| Future perfect "cost" | I | will have cost | |
| Future perfect continuous "cost" | I | will have been costing |