| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it could [adv] [vb infin] | 950 |
|
| 2 | could n't [adv] [vb infin] | 843 |
|
| 3 | it could n't [vb infin] | 184 |
|
| 4 | it could n't [adv] | 35 |
|
