| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] have [vb pp] [prep] | 5871 |
|
| 2 | could [verb] [vb pp] [prep] | 960 |
|
| 3 | could have [verb] [prep] | 898 |
|
| 4 | could have [vb pp] [prep] | 891 |
|
