| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [vb infin] [adv] [prep] [noun] | 64 |
|
| 2 | [vb infin] been [adv] [prep] [noun] | 52 |
|
| 3 | must [vb infin] been [prep] [noun] | 39 |
|
| 4 | must [vb infin] been [adv] [prep] | 23 |
|
