| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what [vb past] [verb] [adj] year | 5 |
|
| 2 | what [vb past] happened [adj] year | 5 |
|
| 3 | what had [verb] [adj] year | 5 |
|
| 4 | what [vb past] [vb pp] [adj] year | 5 |
|
| 5 | what [vb past] happen [adj] year | 5 |
|
