| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [vb pp] [prep] a | 4891 |
|
| 2 | have been [vb pp] back [prep] | 176 |
|
| 3 | have [vb pp] back [prep] a | 32 |
|
| 4 | been [vb pp] back [prep] a | 15 |
|
