| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they could [not/n't] [vb infin] | 1267 |
|
| 2 | [coord] could [not/n't] [vb infin] | 817 |
|
| 3 | [coord] they could [vb infin] | 215 |
|
| 4 | [coord] they could [not/n't] | 170 |
|
