| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what had [verb] at the [noun] | 12 |
|
| 2 | what had [vb pp] at the [noun] | 12 |
|
| 3 | what had [verb] at the [noun] | 12 |
|
| 4 | what had [verb] at the [noun sg] | 11 |
|
| 5 | what had happen at the [noun] | 10 |
|
| 6 | what had happened at the [noun] | 10 |
|
