| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pers pn] have been going on for | 20 |
|
| 2 | it have been [v-ing] on for | 19 |
|
| 3 | [pers pn] 's been [v-ing] on for | 13 |
|
| 4 | [pers pn] have been working on for | 8 |
|
| 5 | [pers pn] had been [v-ing] on for | 7 |
|
| 6 | [pers pn] 've been [v-ing] on for | 7 |
|
