| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could do [adv] | 339 |
|
| 2 | could [verb] [not/n't] | 55 |
|
| 3 | could [vb infin] [not/n't] | 54 |
|
| 4 | [vb mod] do [not/n't] | 37 |
|
| 5 | [modal v] do [not/n't] | 37 |
|
| 6 | could do [not/n't] | 18 |
|
| 7 | could do [not/n't] | 17 |
|
