| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [be] [verb] [modal v] [verb] | 48 |
|
| 2 | have [be] [verb] [modal v] [verb] | 45 |
|
| 3 | [vb -s] [be] [verb] [modal v] [verb] | 19 |
|
