| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] have [adj] [noun] | 3851 |
|
| 2 | [modal v] [verb] [adj] difficulty | 152 |
|
| 3 | [modal v] [vb infin] [adj] difficulty | 152 |
|
| 4 | [modal v] have [adj] difficulty | 75 |
|
