| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] they [verb] been [v-ing] for | 8 |
|
| 2 | [Wh det] they have been [v-ing] for | 8 |
|
| 3 | which they [verb] been [v-ing] for | 6 |
|
| 4 | [Wh det] they [vb past] been [v-ing] for | 5 |
|
