| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [adv] [vb infin] [det] | 1572 |
|
| 2 | could n't [adv] [vb infin] | 843 |
|
| 3 | could n't [vb infin] [det] | 739 |
|
| 4 | n't [adv] [vb infin] [det] | 580 |
|
