| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [verb] [prep] [adv] a | 137 |
|
| 2 | could [verb] [prep] [adv] [art] | 21 |
|
| 3 | could [verb] [prep] [adv] a | 12 |
|
| 4 | could [verb] [prep] [adv] a | 11 |
|
