| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [not/n't] [adv] [vb infin] [pers pn] | 800 |
|
| 2 | could [not/n't] [adv] [vb infin] [pron] | 366 |
|
| 3 | could [adv] [adv] [vb infin] [pers pn] | 272 |
|
| 4 | could [not/n't] [adv] [verb] [pers pn] | 194 |
|
| 5 | could [not/n't] [adv] [vb infin] [pers pn] | 194 |
|
