| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could have [verb] [art] [noun] drop | 8 |
|
| 2 | could have [vb pp] [art] [noun] drop | 8 |
|
| 3 | could have [verb] [art] [noun sg] drop | 8 |
|
| 4 | could have heard [art] [noun] drop | 7 |
|
| 5 | could have [verb] [art] pin drop | 7 |
|
| 6 | could have hear [art] [noun] drop | 7 |
|
| 7 | could have [verb] a [noun] drop | 7 |
|
| 8 | could have [verb] [art] pin drop | 7 |
|
