| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] could have heard a | 9 |
|
| 2 | [pers pn] could have heard a | 8 |
|
| 3 | you could have heard a | 7 |
|
| 4 | you could have heard a | 7 |
|
| 5 | could have heard a [noun sg] | 8 |
|
| 6 | could have heard a [noun] | 8 |
|
| 7 | could have heard a pin | 7 |
|
| 8 | could have heard a pin | 7 |
|
