| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] [vb infin] [conj] prevent | 12 |
|
| 2 | [modal v] [vb infin] [conj] prevent | 12 |
|
| 3 | [adv] [vb infin] [conj] prevent | 5 |
|
| 4 | [vb infin] [pron] [conj] prevent | 5 |
|
