| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | prevent [pron] [prep] [v-ing] | 697 |
|
| 2 | n't prevent [pron] [prep] | 20 |
|
| 3 | n't [pron] [prep] [v-ing] | 15 |
|
| 4 | n't prevent [pron] [v-ing] | 6 |
|
