| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they could have [verb] | 289 |
|
| 2 | could have [verb] a | 273 |
|
| 3 | they could [verb] a | 233 |
|
| 4 | they could have a | 28 |
|
| 5 | they have [verb] a | 5 |
|
