| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [not/n't] [vb infin] [verb] [pron] [prep] | 67 |
|
| 2 | [modal v] [not/n't] [vb infin] do [pron] [prep] | 28 |
|
| 3 | could [adv] [vb infin] do [pron] [prep] | 15 |
|
| 4 | could [not/n't] [verb] do [pron] [prep] | 12 |
|
