| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been going on since | 15 |
|
| 2 | [verb] been going on since | 15 |
|
| 3 | [vb -s] been going on since | 7 |
|
| 4 | has been going on since | 7 |
|
| 5 | been going on since [noun] | 6 |
|
| 6 | been going on since [noun prp] | 5 |
|
| 7 | been going on since [adj] | 5 |
|
