| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] been [verb] on for [det] | 9 |
|
| 2 | had been [verb] on for [det] | 8 |
|
| 3 | [vb past] been [v-ing] on for [det] | 8 |
|
| 4 | [vb past] been [verb] on for some | 8 |
|
| 5 | [vb past] been going on for [det] | 6 |
|
| 6 | [vb past] been go on for [det] | 6 |
|
