| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] be a [noun] | 6118 |
|
| 2 | happened [prep] a [noun] | 70 |
|
| 3 | happened [prep] be a | 32 |
|
| 4 | happened [prep] be [noun] | 21 |
|
