| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could not be [vb pp] [verb] | 208 |
|
| 2 | [modal v] not be [vb pp] [v-ing] | 53 |
|
| 3 | could [adv] be [vb pp] [v-ing] | 40 |
|
| 4 | could not be [verb] [v-ing] | 14 |
|
| 5 | could not [be] [vb pp] [v-ing] | 14 |
|
