| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [vb infin] [prep] [det] [noun] | 146 |
|
| 2 | [vb infin] been [prep] [det] [noun] | 76 |
|
| 3 | must [vb infin] been [det] [noun] | 50 |
|
| 4 | must [vb infin] been [prep] [noun] | 39 |
|
| 5 | must [vb infin] been [prep] [det] | 26 |
|
