| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [prep] a time | 636 |
|
| 2 | occur [prep] a [noun] | 372 |
|
| 3 | occur [prep] a [noun sg] | 364 |
|
| 4 | occur [prep] [art] time | 43 |
|
| 5 | occur [prep] a time | 20 |
|
| 6 | occur [prep] a time | 20 |
|
