| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] not [be] [verb] [prep] [pos pn] | 214 |
|
| 2 | could [adv] [be] [verb] [prep] [pos pn] | 62 |
|
| 3 | could not [be] [verb] [prep] [pron] | 60 |
|
| 4 | could not [be] [verb] [prep] [pos pn] | 33 |
|
