| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it 's been [v-ing] for | 20 |
|
| 2 | it had been [v-ing] for | 17 |
|
| 3 | it has been [v-ing] for | 13 |
|
| 4 | it have been going for | 10 |
|
