| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] they had been [v-ing] | 24 |
|
| 2 | what they [vb past] been [v-ing] | 18 |
|
| 3 | which they [vb past] been [v-ing] | 12 |
|
| 4 | [Wh det] they [vb past] been doing | 9 |
|
| 5 | [Wh det] they 'd been [v-ing] | 7 |
|
