| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which [vb mod] [be] kept | 29 |
|
| 2 | which [vb mod] be kept | 29 |
|
| 3 | which [vb mod] be kept | 29 |
|
| 4 | which [vb mod] [be] kept | 29 |
|
| 5 | which should [be] kept | 13 |
|
| 6 | which must [be] kept | 5 |
|
