| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [not/n't] [vb infin] | 21338 |
|
| 2 | it could [vb infin] | 2635 |
|
| 3 | it could [not/n't] | 981 |
|
| 4 | it [not/n't] [vb infin] | 111 |
|
