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