| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | who [vb past] been [verb] for a | 12 |
|
| 2 | who had been [verb] for a | 11 |
|
| 3 | who [vb past] been [v-ing] for a | 9 |
|
| 4 | who [vb past] been [verb] for a | 9 |
|
