| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it have been [v-ing] on for | 19 |
|
| 2 | it have [been] [v-ing] on for | 19 |
|
| 3 | it have [been] going on for | 17 |
|
| 4 | it 's [been] [v-ing] on for | 13 |
|
