| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | question that have [been] [v-ing] | 9 |
|
| 2 | question that have been [v-ing] | 9 |
|
| 3 | question that have [been] [v-ing] | 7 |
|
| 4 | question that had [been] [v-ing] | 7 |
|
