| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must be [prep] a | 104 |
|
| 2 | must [be] [prep] a | 104 |
|
| 3 | must [be] in a | 29 |
|
| 4 | must [be] in a | 29 |
|
| 5 | must [be] on a | 17 |
|
| 6 | must [be] on a | 17 |
|
| 7 | must [be] of a | 13 |
|
| 8 | must [be] of a | 13 |
|
| 9 | must [be] worth a | 11 |
|
| 10 | must [be] worth a | 11 |
|
| 11 | must [be] for a | 7 |
|
| 12 | must [be] like a | 7 |
|
| 13 | must [be] like a | 7 |
|
| 14 | must [be] for a | 7 |
|
