| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] [adv] | 137677 |
|
| 2 | [modal v] [adv] | 137677 |
|
| 3 | could [adv] | 46692 |
|
| 4 | could [adv] | 17491 |
|
