| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [verb] [prep] a time | 42 |
|
| 2 | be [vb pp] [prep] a time | 37 |
|
| 3 | be [verb] at a time | 24 |
|
| 4 | be [verb] in a time | 5 |
|
| 5 | be [v-ing] [prep] a time | 5 |
|
| 6 | be performed [prep] a time | 5 |
|
| 7 | be perform [prep] a time | 5 |
|
