| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [not/n't] have [vb pp] at [art] | 35 |
|
| 2 | could [not/n't] have [vb pp] at a | 33 |
|
| 3 | could [not/n't] have [vb pp] at a | 33 |
|
| 4 | could [not/n't] have come at [art] | 25 |
|
| 5 | could n't have [vb pp] at [art] | 20 |
|
| 6 | could not have [vb pp] at [art] | 15 |
|
| 7 | could [not/n't] have arrived at [art] | 5 |
|
