| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [vb infin] [prep] | 9758 |
|
| 2 | could [vb infin] be | 3102 |
|
| 3 | [vb infin] be [prep] | 1772 |
|
| 4 | could be [prep] | 912 |
|
