| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | help [verb] | 3062 |
|
| 2 | help [to-vb] | 1369 |
|
| 3 | [verb] to prevent | 1123 |
|
| 4 | [vb infin] to prevent | 137 |
|
| 5 | help to prevent | 99 |
|
| 6 | help prevent | 92 |
|
