| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | that prevent [pers pn] [prep] [verb] [art] | 6 |
|
| 2 | that prevent [pron] from [verb] [art] | 6 |
|
| 3 | that prevent [pron] [prep] [verb] [art] | 6 |
|
| 4 | that prevent [pron] [prep] [v-ing] [art] | 6 |
|
