| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [not/n't] [adv] [vb infin] [adv] | 623 |
|
| 2 | [vb mod] [not/n't] [adv] [vb infin] [adv] | 623 |
|
| 3 | could [adv] [adv] [vb infin] [adv] | 241 |
|
| 4 | could [not/n't] [adv] [verb] [adv] | 157 |
|
| 5 | could [not/n't] [adv] [vb infin] [adv] | 156 |
|
