| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [not/n't] [adv] | 1875 |
|
| 2 | could [adv] remember | 444 |
|
| 3 | could [not/n't] remember | 349 |
|
| 4 | [not/n't] [adv] remember | 176 |
|
