| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] been going on [prep] a | 10 |
|
| 2 | have been going on [prep] a | 10 |
|
| 3 | [vb -s] been going on [prep] a | 9 |
|
| 4 | has been going on [prep] a | 8 |
|
| 5 | been going on [prep] a [noun] | 5 |
|
| 6 | been going on [prep] a [adj] | 5 |
|
| 7 | been going on [prep] a [noun sg] | 5 |
|
