| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [not/n't] prevent [pron] [prep] [v-ing] | 71 |
|
| 2 | [not/n't] [verb] they [prep] [v-ing] | 43 |
|
| 3 | [adv] prevent they [prep] [v-ing] | 19 |
|
| 4 | [not/n't] prevent they [prep] [verb] | 8 |
|
| 5 | [not/n't] prevent they [prep] [v-ing] | 8 |
|
