| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] have [art] [noun] | 6780 |
|
| 2 | [modal v] [verb] [art] difficulty | 98 |
|
| 3 | [modal v] [vb infin] [art] difficulty | 97 |
|
| 4 | [modal v] have [art] difficulty | 50 |
|
