| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [verb] [prep] a | 5419 |
|
| 2 | have previously been [verb] [prep] | 165 |
|
| 3 | previously been [verb] [prep] a | 23 |
|
| 4 | have previously [verb] [prep] a | 19 |
|
