| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb infin] been [verb] for a | 29 |
|
| 2 | have been [verb] for a | 29 |
|
| 3 | [vb infin] been [vb pp] for a | 24 |
|
| 4 | [vb infin] been [v-ing] for a | 5 |
|
