| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [vb pp] once a | 43 |
|
| 2 | be [verb] once a | 41 |
|
| 3 | be [verb] once a | 20 |
|
| 4 | is [verb] once a | 9 |
|
| 5 | are [verb] once a | 6 |
|
| 6 | was [verb] once a | 5 |
|
