| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] it have been | 470 |
|
| 2 | it have been [v-ing] | 414 |
|
| 3 | [verb] have been [v-ing] | 196 |
|
| 4 | [verb] it been [v-ing] | 12 |
|
