| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | question that have been [v-ing] | 7 |
|
| 2 | question [that] have been [v-ing] | 7 |
|
| 3 | question that have been [v-ing] | 7 |
|
| 4 | question [conj] had been [v-ing] | 5 |
|
