| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they could [not/n't] be [verb] [adv] | 11 |
|
| 2 | they could [not/n't] be [verb] [adv] | 10 |
|
| 3 | they could [not/n't] be [vb pp] [adv] | 10 |
|
| 4 | they could not be [verb] [adv] | 8 |
|
