| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it have been [v-ing] for | 50 |
|
| 2 | [Wh det] have been [v-ing] for | 37 |
|
| 3 | [Wh det] it have been [v-ing] | 15 |
|
| 4 | [Wh det] it have been for | 5 |
|
