| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they should be [verb] | 851 |
|
| 2 | they should be [vb pp] | 720 |
|
| 3 | they [modal v] be seen | 124 |
|
| 4 | [pron] should be seen | 52 |
|
| 5 | they should be see | 12 |
|
| 6 | they should [be] seen | 11 |
|
| 7 | they should be seen | 11 |
|
| 8 | they should [be] seen | 11 |
|
