| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which prevented them from [v-ing] | 6 |
|
| 2 | which prevented them [prep] [v-ing] | 6 |
|
| 3 | which prevented them [prep] [v-ing] | 6 |
|
| 4 | which prevented them from [v-ing] | 6 |
|
