| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh pn] have been [vb pp] for [v-ing] | 12 |
|
| 2 | who have be [vb pp] for [v-ing] | 11 |
|
| 3 | [Wh pn] had be [vb pp] for [v-ing] | 8 |
|
