| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] have be | 21175 |
|
| 2 | could [vb infin] be | 3102 |
|
| 3 | could [verb] be | 3102 |
|
| 4 | could have be | 2545 |
|
| 5 | could have [be] | 2482 |
|
