| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | to prevent [pron] [prep] [verb] | 140 |
|
| 2 | [pron] [pron] [prep] [verb] | 28 |
|
| 3 | [pron] to prevent [pron] [verb] | 10 |
|
| 4 | [pron] to prevent [pron] [prep] | 7 |
|
