| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [verb] to participate in the | 23 |
|
| 2 | [be] [vb pp] to participate in the | 22 |
|
| 3 | [be] invite to participate in the | 10 |
|
| 4 | [was/were] [verb] to participate in the | 10 |
|
| 5 | [be] invited to participate in the | 10 |
|
| 6 | were [verb] to participate in the | 8 |
|
| 7 | [be] [verb] to participate in the | 5 |
|
| 8 | be [verb] to participate in the | 5 |
|
