| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [det] doubt | 14 |
|
| 2 | [verb] been some doubt | 7 |
|
| 3 | [vb past] been [det] doubt | 5 |
|
| 4 | [vb infin] been [det] doubt | 5 |
|
| 5 | have been [det] doubt | 5 |
|
