| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] they [prep] [verb] | 884 |
|
| 2 | [to-vb] they [prep] [verb] | 206 |
|
| 3 | prevent they [prep] [verb] | 170 |
|
| 4 | to prevent [pron] [prep] [verb] | 140 |
|
| 5 | to prevent they [prep] [verb] | 41 |
|
