| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [vb infin] been a [adj] | 202 |
|
| 2 | must [vb infin] been [adj] [conj] | 75 |
|
| 3 | [vb infin] been a [adj] [conj] | 31 |
|
| 4 | must [vb infin] a [adj] [conj] | 19 |
|
