| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [vb pp] [prep] [noun pl] | 7236 |
|
| 2 | must be [vb pp] [prep] | 4919 |
|
| 3 | must be [vb pp] [noun pl] | 13 |
|
| 4 | must be [prep] [noun pl] | 11 |
|
