| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [vb mod] not be seen | 20 |
|
| 2 | it [modal v] not be seen | 20 |
|
| 3 | it [modal v] not be seen | 20 |
|
| 4 | it [modal v] not be seen | 14 |
|
| 5 | it can not be seen | 6 |
|
| 6 | it [modal v] n't be seen | 6 |
|
| 7 | it can not be seen | 6 |
|
| 8 | it could not be seen | 5 |
|
| 9 | it could not be seen | 5 |
|
