| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [det] [modal v] [verb] been a | 120 |
|
| 2 | [det] [vb mod] [verb] been a | 120 |
|
| 3 | [det] must [verb] been [art] | 39 |
|
| 4 | [det] must [verb] been [art] | 39 |
|
| 5 | [det] must [verb] been a | 28 |
|
| 6 | [adj] must [verb] been a | 26 |
|
| 7 | [det] must [verb] [been] a | 24 |
|
| 8 | [det] must [verb] be a | 24 |
|
| 9 | [det] must [verb] [be] a | 24 |
|
| 10 | [det] must [verb] been a | 24 |
|
