| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [be] [prep] a | 104 |
|
| 2 | must [be] [prep] a | 104 |
|
| 3 | [vb mod] [be] for a | 67 |
|
| 4 | [modal v] [be] for a | 67 |
|
| 5 | must [be] for [art] | 27 |
|
| 6 | must [be] for [art] | 27 |
|
| 7 | must [be] for a | 7 |
|
| 8 | must [be] for a | 7 |
|
| 9 | must [be] for a | 7 |
|
| 10 | must [be] for a | 7 |
|
