| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] be held to | 34 |
|
| 2 | [vb mod] [be] held to | 34 |
|
| 3 | [vb mod] be held to | 34 |
|
| 4 | should [be] held to | 10 |
|
| 5 | must [be] held to | 6 |
|
