| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what they have been [v-ing] | 37 |
|
| 2 | [Wh det] they had been [v-ing] | 24 |
|
| 3 | which they have been [v-ing] | 20 |
|
| 4 | [Wh det] they have been doing | 20 |
|
| 5 | [Wh det] they have been [v-ing] | 17 |
|
| 6 | [Wh det] they 've been [v-ing] | 11 |
|
| 7 | [Wh det] they 'd been [v-ing] | 7 |
|
