| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could have [art] [noun] | 407 |
|
| 2 | [modal v] have [art] effect | 247 |
|
| 3 | could [verb] [art] effect | 30 |
|
| 4 | could [vb infin] [art] effect | 30 |
|
| 5 | could have [art] effect | 18 |
|
