| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun pl] could have been [vb pp] | 143 |
|
| 2 | [noun pl] could have be [vb pp] | 142 |
|
| 3 | [noun pl] could have be used | 10 |
|
| 4 | [noun pl] could have be avoided | 9 |
|
