| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have happened [prep] [det] time | 9 |
|
| 2 | have happened [prep] [det] time | 9 |
|
| 3 | have happened at [det] time | 5 |
|
| 4 | have happened at [det] time | 5 |
|
