| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | to prevent [pron] [prep] [verb] | 140 |
|
| 2 | [adv] [pron] [prep] [verb] | 25 |
|
| 3 | [adv] to prevent [pron] [verb] | 19 |
|
| 4 | [adv] to prevent [pron] [prep] | 9 |
|
