| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [modal v] have | 741 |
|
| 2 | [vb past] [modal v] [verb] | 496 |
|
| 3 | [vb past] [modal v] [vb infin] | 485 |
|
| 4 | [vb past] [modal v] have | 112 |
|
