| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] have been [v-ing] [det] | 12 |
|
| 2 | which have [been] [v-ing] [det] | 11 |
|
| 3 | [Wh det] had [been] [v-ing] [det] | 5 |
|
