| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [vb pp] [prep] [art] [noun pl] | 3499 |
|
| 2 | must be [vb pp] [prep] [art] | 2033 |
|
| 3 | must be [vb pp] [prep] [noun pl] | 220 |
|
| 4 | must be [prep] [art] [noun pl] | 22 |
|
| 5 | must be [vb pp] [art] [noun pl] | 8 |
|
