| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [was/were] [verb] [pron] [prep] [verb] | 69 |
|
| 2 | [was/were] [v-ing] [pron] [prep] [verb] | 61 |
|
| 3 | [be] preventing [pron] [prep] [verb] | 13 |
|
| 4 | [was/were] prevent [pron] [prep] [verb] | 9 |
|
