| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] [not/n't] [adv] [vb infin] | 6382 |
|
| 2 | [modal v] [not/n't] [adv] [vb infin] | 6382 |
|
| 3 | could [adv] [adv] [vb infin] | 2430 |
|
| 4 | could [not/n't] [adv] [verb] | 1461 |
|
| 5 | could [not/n't] [adv] [vb infin] | 1457 |
|
