| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they could have [verb] [prep] [det] | 8 |
|
| 2 | they could have [verb] [prep] [det] | 8 |
|
| 3 | they could have [verb] [det] [noun] | 8 |
|
| 4 | they could have [verb] [det] [noun sg] | 6 |
|
