| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what they have been [v-ing] | 37 |
|
| 2 | what they [vb base] been [v-ing] | 19 |
|
| 3 | what they [verb] been doing | 19 |
|
| 4 | what they [vb past] been [v-ing] | 18 |
|
| 5 | what they had been [v-ing] | 13 |
|
| 6 | what they 've been [v-ing] | 10 |
|
| 7 | what they have been [v-ing] | 9 |
|
| 8 | what they 'd been [v-ing] | 5 |
|
