| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] have been going on | 8 |
|
| 2 | [modal v] have been going on | 8 |
|
| 3 | have been going on [prep] | 5 |
|
| 4 | have been going on [prep] | 5 |
|
