| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] it have been [v-ing] | 15 |
|
| 2 | which it have [been] [v-ing] | 12 |
|
| 3 | [Wh det] it has [been] [v-ing] | 7 |
|
| 4 | [Wh det] it had [been] [v-ing] | 6 |
|
