| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must of been [adj] | 41 |
|
| 2 | must [prep] been [adj] | 41 |
|
| 3 | must [prep] been [adj] | 16 |
|
| 4 | must [prep] been [det] | 12 |
|
| 5 | must [prep] been [num] | 10 |
|
| 6 | must [prep] been some | 6 |
|
| 7 | must [prep] been some | 6 |
|
