| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [not/n't] [verb] [prep] a | 755 |
|
| 2 | could [not/n't] [verb] [prep] [art] | 626 |
|
| 3 | could [not/n't] [verb] [prep] [art] | 626 |
|
| 4 | could [adv] [verb] [prep] a | 329 |
|
| 5 | could [not/n't] [verb] [prep] a | 174 |
|
