| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could n't [verb] | 12359 |
|
| 2 | [modal v] n't think | 1094 |
|
| 3 | could [adv] think | 333 |
|
| 4 | could [not/n't] think | 274 |
|
| 5 | could not think | 273 |
|
