| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [be] [vb pp] [prep] [art] | 2033 |
|
| 2 | which must [be] [vb pp] [prep] | 215 |
|
| 3 | which must [be] [vb pp] [art] | 6 |
|
| 4 | which must [be] [prep] [art] | 5 |
|
