| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | that must be [vb pp] be | 13 |
|
| 2 | that must be [vb pp] [be] | 13 |
|
| 3 | that must be [vb pp] is | 11 |
|
| 4 | that must be [vb pp] [is] | 11 |
|
