| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had been going on [prep] | 41 |
|
| 2 | had [been] going on [prep] | 41 |
|
| 3 | had be going on [prep] | 41 |
|
| 4 | had [be] going on for | 23 |
|
| 5 | had [be] going on in | 8 |
|
