| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [adv] [be] seen | 947 |
|
| 2 | [modal v] [adv] [not/n't] [be] | 373 |
|
| 3 | [modal v] [not/n't] [be] seen | 279 |
|
| 4 | [adv] [not/n't] [be] seen | 15 |
|
