| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun prp] could [not/n't] [vb infin] | 1381 |
|
| 2 | [coord] could [not/n't] [vb infin] | 817 |
|
| 3 | [coord] [noun prp] could [vb infin] | 353 |
|
| 4 | [coord] [noun prp] could [not/n't] | 172 |
|
