| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb -s] been going on for | 52 |
|
| 2 | [vb -s] be going on for | 52 |
|
| 3 | has be going on for | 37 |
|
| 4 | 's be going on for | 15 |
|
