| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] [modal v] [not/n't] [vb infin] | 3621 |
|
| 2 | [conj] could [adv] [vb infin] | 1344 |
|
| 3 | [conj] could [not/n't] [verb] | 881 |
|
