| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [not/n't] [adv] [vb infin] [be] | 147 |
|
| 2 | could [adv] [adv] [vb infin] [be] | 100 |
|
| 3 | could [not/n't] [adv] [verb] [be] | 46 |
|
