| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [subord] it had been [v-ing] | 20 |
|
| 2 | [subord] it 's been [v-ing] | 14 |
|
| 3 | [subord] it has been [v-ing] | 11 |
|
| 4 | if it have been [v-ing] | 8 |
|
| 5 | as it have been [v-ing] | 6 |
|
| 6 | though it have been [v-ing] | 6 |
|
| 7 | where it have been [v-ing] | 6 |
|
