| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which [verb] [pron] [prep] [v-ing] | 92 |
|
| 2 | which [vb past] [pron] [prep] [v-ing] | 44 |
|
| 3 | which prevent [pron] [prep] [v-ing] | 38 |
|
| 4 | [pron] prevented [pron] [prep] [v-ing] | 25 |
|
| 5 | which prevented [pron] [prep] [verb] | 15 |
|
