| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what [pers pn] have been [v-ing] | 403 |
|
| 2 | [vb infin] [pers pn] have been [v-ing] | 66 |
|
| 3 | [vb infin] what [pers pn] have been | 53 |
|
| 4 | [vb infin] what have been [v-ing] | 10 |
|
