| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | while [noun prp] [vb past] been [verb] | 12 |
|
| 2 | while [noun prp] [vb past] been [v-ing] | 7 |
|
| 3 | while [noun prp] [vb past] been [vb pp] | 5 |
|
