| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] help prevent [noun] | 12 |
|
| 2 | [vb mod] [vb infin] prevent [noun] | 12 |
|
| 3 | [vb mod] help prevent [noun] | 12 |
|
| 4 | [vb mod] [verb] prevent [noun sg] | 8 |
|
| 5 | can [verb] prevent [noun] | 7 |
|
