| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which has be [verb] a | 29 |
|
| 2 | which has been [verb] a | 29 |
|
| 3 | which has be [vb pp] a | 17 |
|
| 4 | which has be [v-ing] a | 11 |
|
