| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] could [not/n't] [vb infin] | 14304 |
|
| 2 | it [modal v] [not/n't] [vb infin] | 4409 |
|
| 3 | it could [adv] [vb infin] | 950 |
|
| 4 | it could [not/n't] [verb] | 471 |
|
