| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [det] be [pron] happened | 134 |
|
| 2 | [det] be [pron] to | 39 |
|
| 3 | be [pron] happened to | 33 |
|
| 4 | [det] [pron] happened to | 10 |
|
