| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had [been] prevented from [verb] | 12 |
|
| 2 | had been prevented from [verb] | 12 |
|
| 3 | had be prevented from [verb] | 12 |
|
| 4 | had [be] prevented from [v-ing] | 12 |
|
