| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [not/n't] [adv] [adv] [verb] | 27 |
|
| 2 | could [not/n't] [adv] [adv] [vb infin] | 27 |
|
| 3 | could [not/n't] [adv] [adv] [verb] | 25 |
|
| 4 | could n't [adv] [adv] [verb] | 20 |
|
| 5 | could [not/n't] [adv] well [verb] | 11 |
|
| 6 | could [not/n't] [adv] well [verb] | 11 |
|
| 7 | could [not/n't] very [adv] [verb] | 11 |
|
| 8 | could [not/n't] very [adv] [verb] | 11 |
|
| 9 | could not [adv] [adv] [verb] | 7 |
|
