| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [was/were] happening at [art] time | 8 |
|
| 2 | [was/were] happening [prep] [art] time | 8 |
|
| 3 | was happening [prep] [art] time | 6 |
|
| 4 | [was/were] happening [prep] the time | 5 |
|
