| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had be keep [adj] | 23 |
|
| 2 | [vb past] been keep [adj] | 23 |
|
| 3 | [vb past] be kept [adj] | 21 |
|
| 4 | [vb past] be keep secret | 6 |
|
