| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [was/were] held on | 233 |
|
| 2 | conference [was/were] held [prep] | 51 |
|
| 3 | conference [was/were] [vb pp] on | 11 |
|
| 4 | conference [was/were] [verb] on | 11 |
|
| 5 | conference [be] held on | 5 |
|
| 6 | conference [was/were] hold on | 5 |
|
