| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it must be [vb pp] that [adj] | 31 |
|
| 2 | [pers pn] must be [vb pp] that [adj] | 31 |
|
| 3 | [pers pn] must be said that [adj] | 6 |
|
| 4 | [pers pn] must be remembered that [adj] | 5 |
|
