| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [vb infin] [be] [adv prt] [prep] the | 5 |
|
| 2 | must [vb infin] be [adv prt] [prep] the | 5 |
|
| 3 | must [vb infin] [been] [adv prt] [prep] the | 5 |
|
| 4 | must [vb infin] been [adv prt] [prep] the | 5 |
|
