| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | prevent [pers pn] [prep] [v-ing] | 645 |
|
| 2 | be prevent [prep] [v-ing] | 275 |
|
| 3 | be [pers pn] [prep] [v-ing] | 81 |
|
| 4 | be prevent [pers pn] [prep] | 17 |
|
| 5 | be prevent [pers pn] [v-ing] | 9 |
|
