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