| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] have [verb] [prep] [art] | 2510 |
|
| 2 | could [verb] [verb] [prep] [art] | 395 |
|
| 3 | could [vb infin] [verb] [prep] [art] | 394 |
|
| 4 | could have [verb] [prep] [art] | 281 |
|
| 5 | could have [verb] [prep] [art] | 273 |
|
