| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they can be [verb] | 1299 |
|
| 2 | they can be [vb pp] | 1294 |
|
| 3 | they [vb mod] be kept | 39 |
|
| 4 | they [modal v] be kept | 39 |
|
| 5 | [pron] can be kept | 19 |
|
| 6 | they can [be] kept | 7 |
|
| 7 | they can be kept | 7 |
|
| 8 | they can [be] kept | 7 |
|
| 9 | they can be keep | 7 |
|
| 10 | they can be kept | 7 |
|
