| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | years after it was [verb] | 21 |
|
| 2 | years after it [was/were] [vb pp] | 21 |
|
| 3 | years after it [was/were] [verb] | 21 |
|
| 4 | years after it [was/were] [verb] | 21 |
|
